Freelancer designer preco por horaงาน

การออกแบบระบบไฟฟ้า เขียนแบบ เซ็นแบบ และการออกแบบระบบแจ้งเหตุเพลิงไหม้ ระบบป้องกันฟ้าผ่า การประมานราคาระบบไฟฟ้า

ออกแบบเครื่องประดับ ข้อมือ,แหวน,สร้อย เป็นต้น มีไอเดียดี มีสไตล์ที่ชัดเจน ออกแบบมากกว่า 50ชิ้น สามารถวาดมือ และใช้โปรแกรมได้

พัฒนางาน front end design ในรูปแบบ HTML CSS และ Javascript ซึ่งจะนำไปใช้ต่อกับ 2 เว็บไซต์ ได้แก่ และ ซึ่งเคยจ้าง designer เขียนโค้ดไปแล้วบางส่วนแต่ยังไม่สมบูรณ์ ลองดูในลิงค์ Google Drive ในไฟล์แนบของแต่ละโปรเจ็ค ขอบเขตงานอยู่ในไฟล์แนบ แบ่งงานเป็น 3 โปรเจ็ค เลือกทำ 1 โปรเจ็คที่คิดว่าถนัดที่สุด ขอให้เสนอราคาและระยะเวลาในการพัฒนาของโปรเจ็คที่ต้องการทำครับ สนใจแอดไลน์มาที่ Line id: paramathone

ตามหา UX Designer สำหรับร่วมพัฒนาแอพริเคชั่นบน iPhone เป็นเวลา 1-2 เดือน เน้นหนักทางด้านการออกแบบ User experience เข้าใจระบบการทำเทสกับยูสเซอร์ สามารถทำเต็มเวลา ออกไปทำเทสสม่ำเสมอจนวัดผลได้จริง รับผิดชอบงานจนกระทั่ง วัดผลได้เป็นรูปเป็นร่าง มีค่าใช้จ่ายให้ 30k-40k คะ

AppDever (แอพดีเว่อร์) ในเครือบริษัท As Your Mind เปิดรับสมัคร 1. iOS Programmer 1 ตำแหน่ง FullTime - Objective-C เป็นหลักครับ - ถ้าได้ Swift หรือ Android ด้วยก็จะดีครับ เงินเดือนประมาณ 18 - 27k 2. Graphic Designer 1 ตำแหน่ง FullTime - เน้นออกแบบ UX/UI Mobile Application / Website / Icon และ Logo - ถ้าใช้ Sketch ด้วยจะดีมากครับ เราเป็น Startup มีงาน Mobile app / Web app ทั้งจากลูกค้าและ Product ของตัวเองหลายตัว อยากได้ทีมงานไฟแรง ยังไม่เก่งไม่เป็นไร ขอให้ชอบและสนุกที่จะเรียนรู้สิ่งใหม่ๆ เสมอ ทำงานเป็นกันเอง ร่วมแชร์ความรู้และประสบการณ์กันและกัน และพร้อมที่จะโตไปด้วยกัน ตอนนี้มี ออฟฟิสอยู่ 3 ที่คือ 1. ลาดพร้าว 136 เกือบติดถนนใหญ่เดินทางสะดวก ใกล้ themall และ makro บางกะปิ 2. ลาดพร้าว 101 ใกล้ Lotus 3. รัชดาซอย 3 ใกล้ MRT พระราม 9 / ฟอร์จูนรัชดา / เซ็นทรัลพระรา...

we need an experienced mobile app designer to create design for our app so please approach with your previous work experiences. We will share exact requirement with selected one. Thank you!

Somos uma empresa de óculos que atua no varejo. Como atuamos a nivel internacional, precisamos de uma solução para dublagem dos videos que temos de treinamentos para serem disponibilizados nas linguas Ingles e Espanhol. Precisamos que esses videos sejam dublados com inteligencia artificial, pois temos um volume de 50 videos por ano, em media 3 minutos por video. Então um estudio com dublador e diretor ficaria muito elevado o custo. Já fizemos internamente mas por conta do volume precisamos freelar.

I'm in need of a skilled 3D designer who can take my concept and transform it into an interactive prototype of an electronic device. Key requirements include: - Knowledge in industrial design, particularly in electronics - Expertise in creating 3D prototypes - Ability to align with my vision and provide creative input for design improvement From the outset, I'm relying on the designer's technical and creative abilities as I'll be providing the basic concept without a detailed sketch. In addition to creating a detailed and realistic 3D model of the electronic device, I would love your inputs on functionality and aesthetics. If you're keen on bringing innovative products to life and possess the mentioned skills, I'd love to discuss further.

Presupuesto 50 dolares todos los cambios están en el pdf adjunto Debo realizar arreglos al sistema existente, los mismos se encuentran adjuntos. Algunos son errores, otros son cambios. Modificación de visualización. Posiblidad de cambio de columnas que se ven. Mejoras en el buscador Agregar que se pueda dejar registro por cada quien pasa.

...crear una app, que sea capas de poder crear y enviar recordatorios de cobranza a clientes vía watsapp y también poder generar facturas para de cobro/Pago y poder enviar ya sea en Formato de imagen JPG o PDF La app estaría compuesta por 2 apartados, ......... Apartado #1 - Recordatorios por watsapp, Este Apartado se necesitan los siguientes campos, - sincronizar contactos - campo para texto - calendario - programar recordatorios por -Dia, Semana, Mes, Año o fechas personalizadas - repetir recordatorios automáticamente - Enviar recordatorios automáticamente según la hora y fecha programada - solicitar permiso si es necesario para desbloquear pantaya del teléfono y poder enviar los recordatorios autom&aac...

We are looking for a skilled and experienced UI/UX designer to assist our team with planning and designing our platform’s front-end website. Work closely with our team, including backend developers to ensure cohesive integration of front-end and back-end functionalities. Key Responsibilities: Design Development: Create wireframes, mockups, and potentially prototypes for key pages such as the home page, raffle entry page, and user dashboard. User Experience Optimization: Ensure an intuitive and seamless user experience, especially for those unfamiliar with blockchain technology. Responsive Design: Develop a platform that is fully responsive and optimized for all devices and screen sizes. Brand Integration: Incorporate provided branding elements and suggest enhancements wh...

Description: We are a large digital advertising company based in Israel, seeking a talented and creative freelancer to join our team. We need a skilled copywriter and designer to create compelling ad banners in English for various advertising campaigns. Responsibilities: Write engaging and persuasive copy for advertising banners. Design visually appealing and effective ad banners. Collaborate with our marketing team to ensure the ads align with our branding and campaign goals. Meet deadlines and manage multiple projects simultaneously. Requirements: Proven experience as a copywriter and banner designer. Strong portfolio showcasing previous work in advertising. Excellent command of the English language. Proficiency in design software such as Adobe Photoshop, Illust...

Busco editor video para video de gamplay,shorts 1 a 3 min en determinado estilo,razon de 8 a 12 videos por mes,relacion a largo plazo. Se busca pasar de esto: @niriiv/video/7184113885459336453 A estos estilos: Paga: Estilo Kesto: 5usd Estilo Tdawg/Crowder: 10 usd Estilo Futives (8 a 15 min): 15 usd Enviar presupuesto

I'm in need of a talented and experienced UX designer to create an end-to-end game specification for a captivating and uncomplicated game for mobile devices. - Target Audience: The game is designed to be accessible to all age groups, so it should have a universal appeal and be easy to understand and play. - Primary Goal: The game's core objective is to entertain the players. It should be engaging and provide a satisfying gaming experience. - Preferred Genre/Style: The game falls under the category of hand and mind coordination. This indicates that the game will challenge the player's ability to quickly and accurately coordinate their hands with their mental processes. Ideal skills and experience for this job include: - Proven track record of designing successful mo...

Description: We are an established online arts and crafts company seeking a talented and dedicated graphic designer to join our team immediately. The role involves creating daily orders from templates, designing new product images, and assisting with branding efforts. Responsibilities: Utilize Adobe Illustrator to create and modify designs based on provided templates. Generate new product images for our online listings on platforms like Amazon and eBay. Assist in branding projects to enhance our company's visual identity. Work with provided files and access resources to fulfill daily orders. Input information from spreadsheets into AI templates, adjust text, and save the files as needed. Requirements: Proficient in Adobe Illustrator with a strong understanding of the softwa...

I'm looking for an experienced graphic designer who can create a realistic cartoon logo for my business. The logo will feature an African stylist doing a child's Afro hair. Key Project Details: - I need the logo to be in a realistic style, not overly cartoonish or abstract. - The logo will be used across various platforms such as my website, business cards, and social media, so it should be versatile and scalable. - The color scheme should mainly consist of earth tones. The Ideal Candidate Should Possess: - Proven experience in graphic design, particularly in creating realistic cartoon logos. - A strong portfolio showcasing similar projects. - Understanding of color theory and the ability to work with earth tones effectively. - Excellent communication skills to understa...

We are seeking a highly skilled WordPress developer with expertise in WooCommerce and Elementor to resolve layout issues on our cart page. The buttons on the cart page are not properly aligned, and we need someone who can quickly identify and fix these alignment issues to ensure a seamless user experience. Woocommerce WordPress  Elementor  hTMl

I need a creative edge to breathe new life into my clothing brand. I'm searching for a talented fashion designer who can create contemporary, casual designs specifically for adults. Key requirements of the role: - Designing casual wear: This project focuses solely on adult clothing, so experience with contemporary and casual design is essential. - Innovation in fashion: I'm after someone who is not afraid of pushing the boundaries and trying something new. - Knowledge of current trends: Awareness of ongoing fashion trends for adults is important to ensure our brand remains relevant and appealing. - Demonstrable experience: Please provide examples of your previous work, particularly with casual wear design for adults. Your unique touch could be the one to define the futu...

I am in need of an innovative graphic designer with a knack for modern, minimalist designs to revamp my company's online and offline presence. Key Tasks: - Design a visually appealing, user-friendly website that showcases our products/services to the general public. Experience in UX/UI design is highly desirable. - Create a sleek logo that reflects our company's modern ethos. - Design brochures that effectively communicate who we are and what we do. Previous experience in print design is a plus. - Generate mockups for mobile and web applications that align with our aesthetic and operational goals. The ideal candidate will have a strong portfolio featuring modern and minimalist designs and have experience designing for diverse audiences. I look forward to seeing you...

I am looking for a skilled designer to help create an engaging Shopify website. I need the website to include a product catalog, a shopping cart, and an integrated payment gateway. I do not have a specific design in mind, and I welcome your creative suggestions. My preference, however, lies towards a minimalistic design with easy navigation. The ideal freelancer for this job would have: - Experience in designing Shopify websites. - A knack for minimalistic and intuitive design. - Accomplished skills in product catalog setup, shopping cart implementation, and payment gateway integration. - A creative mindset and the ability to incorporate my suggestions and ideas into the design. Your proposal will be more appealing to me if it includes links to previous Shopify websites yo...

I am looking for a talented graphic designer to help me create some cool and funny T-shirts for my brand targeting professionals in the IT industry. You don't need to know code, but understanding some tech humor will be helpful! Key Responsibilities: - Translate my ideas into visually appealing and humorous designs for T-shirts - Create innovative and quirky designs with an insider IT perspective - Collaborate with me to ensure that the designs appeal to our target audience and align with our brand image Experience & Skills: - Proven experience in graphic design and expertise on design software and technologies. (Only Basic understanding of IT) - Strong aesthetic skills with the ability to combine various colors, fonts, and layouts - Understanding of the IT industry, ...

¡Atención, talentosos diseñadores editoriales! Estamos buscando a un creativo excepcional, con una fuerte habilidad en diseño estético y una pasión por transformar conceptos en arte visual. Si te entusiasma la idea de rediseñar un libro único, que combina texto, gráficos a color, y un estilo minimalista, ¡esta oportunidad es para ti! Palabra clave para aplicar: Yaku Referencia: Lo que necesitas para el trabajo: - Experiencia Comprobada: Necesitamos ver tu habilidad a través de tu portafolio. Envíanos tus trabajos anteriores que incluyan libros, revistas, y cualquier otro material editorial que demuestre tu talento y versatilidad en diseño. - Habilidades en InDesign: Debes dominar Adobe InDes...

I am seeking an experienced UX/UI designer who can help me bring my vision for a mobile social entertainment application to life. Key Responsibilities: - Design user experiences from low-fidelity sketches to hi-fidelity pixel perfect mockups. - Create intuitive and appealing user interfaces for mobile devices. - Coordinate and work closely with the development team to ensure design compatibility. - Create an interactive prototype (UI) Ideal Skills and Qualifications: - Previous experience designing mobile applications, particularly in the social entertainment field. - Proficiency in standard UX/UI software such as Sketch, OmniGraffle, Axure, InVision, UXPin, Balsamiq. - Pportfolio showcasing previous work examples.

* Must have atleast 1 year experience working with on-page/off-page optimization, link-building, directory submissions, blog/forum commenting, article submissions, back link strategy implementation and link wheeling. * Develop and execute SEO strategies to increase organic search rankings and traffic. * Perform keyword research and identify target keywords for optimiza...Analytics and Search Console. * Collaborate with cross-functional teams to implement SEO recommendations. * Be responsible for all regular (and ad hoc) reporting and analysis of digital activity providing crucial insights into further sales and marketing opportunities. Please share your relevant experience and strategies you plan to implement to achieve my goal of increasing website traffic Only Freelancer allowe...

...utilizando XAMPP (phpmyadmin) y Apache NetBeans/Eclipse como entorno. La pagina tiene que tener un inicio de sesión/registro de 2 tipos de usuario (usuario cliente y administrador). La pagina tendrá un menú de navegación en la parte superior con varias pestañas: inicio (introduccion a la web, ultimas noticias, etc), videojuegos (aqui estaran todos los videojuegos de la web con un filtro de busqueda por genero y plataforma sacado de la base de datos donde se ve el nombre de cada uno, foto de su portada, genero, plataforma, fecha de lanzamiento, etc. y alguna opcion para ponerles nota, opinar, añadir a tu lista/coleccion del usuario logeado, etc.), coleccion (aqui podras ver las colecciones/listas de los usuarios de la pagina y todas las op...

I'm a graphic designer looking for freelance opportunities. I have a strong background in creating visually appealing designs for various purposes. I am proficient in using design tools and software to deliver high-quality work. I'm looking forward to exciting projects that challenge my creativity and expertise.

I worked incredibly hard for over a year to bring you a top-notch learning program with Freelancer.com that was never revealed before… It's not just about teaching you everything I know and sharing my journey to the #1 amongst 70 million people; it's also about connecting you with a great community.. Once you complete the program and pass the test, you'll earn an exclusive badge that very few people get.. But.. Also, you get all of the following INCLUDED with NO HIDDEN COST in a YEARLY price of 129 USD: ➡️ Be among the elite few to earn the new IFC badge on your profile so that you can stand out! (Upon successful completion of the test) - Priceless! ➡️ Unlock hours of groundbreaking video content I’ve been working on for months that's nowhere else to b...

I'm looking for a skilled designer who can quickly create a logo for my business. Thanks

I'm in search of a skilled freelance graphic designer with a strong proficiency in logo design. This work requires a creative thinker, capable of developing unique and clever designs. Key Requirements: - Proficient in logo design - Skilled in creating modern, minimalist designs Final Deliverables: - Raster files (JPEG, PNG) - PDF files Experience in advertising design and video creation is a plus, as the role may evolve to encompass these areas in the future. The ideal candidate will be self-disciplined and able to work effectively in a fast-paced and ever-changing environment. I look forward to your bids.

I am looking for a skilled UI/UX designer to create a visually appealing, user-friendly website design. We don’t need you to develop the website just the layout and the designs. Key requirements: - Create a modern, attractive design - Prior experience in designing websites - Ability to work independently and bring creative ideas to the table - Proficient in using design tools like Adobe XD, Sketch, Figma, etc. Here are the website references - - Looking forward to seeing your portfolio and discussing further.

I'm looking for a skilled web designer, proficient in UI/UX and Wordpress, to build me a website intended for my existing service-based business in Dubai. The primary goal of this website is to facilitate the setup of my client's business in Dubai. Existing website to be redesigned - Key Requirements: - Experience with UI/UX design: I'm seeking a professional who can create a visually appealing and user-friendly interface to enhance the website's usability. - Proficiency in Wordpress: I would prefer someone with a solid understanding of the Wordpress platform, as this will be the backbone of the website. Target Audience: - Businesses: As my focus is on setting up a service-based business, the website will need to be tailored to appeal to other businesses in ...

I'm in need of a proficient graphic designer with a knack for elegant and professional 3D logo animations. The animation will be primarily used in my social media profiles and needs to be elegant and mysterious in color. Key Requirements: - Expertise in 3D animation - Portfolio demonstrating elegant and professional style Your application should include examples of similar animations you've done in the past. I look forward to seeing your proposals. I do not need automatic responses. Go through the attached reference video and see if you could able to create logo animation similar to this. Reference Video:

I'm in need of a proficient graphic designer with a knack for elegant and professional 3D logo animations. The animation will be primarily used in my social media profiles and needs to be elegant and mysterious in color. Key Requirements: - Expertise in 3D animation - Portfolio demonstrating elegant and professional style Your application should include examples of similar animations you've done in the past. I look forward to seeing your proposals. i do not need automatic messages. Reference Video:

I'm in need of a skilled mobile game app designer who can create a virtual workspace game for both iOS and Android platforms. The primary genre will be a Virtual Work Space, which is a unique concept. It's a mix of productivity tools and a game. Key Features: - The app should have audio sharing capabilities where users can share audio files with each other. - The app will also have a feature which creates a virtual lecture hall where users can attend virtual lectures. Ideal Skills: - Strong experience in mobile game app design, especially for iOS and Android platforms. - Understanding of virtual workspaces and productivity tools. - Previous experience with audio sharing and lecture hall features would be highly advantageous.

We have an existing 10 x 20 booth but we are taking a 20x20 space for our next event. Looking for a designer who can help us redesign our existing booth so that we can just change some graphics, incorporate in a few elements and make it look new.

As a client looking to increase my income, I'm in need of a talented graphic designer for logo creation. While I've not specified a preferred style in this listing, I'm expecting the chosen freelancer to be adept at determining and executing the best stylistic approach based on my input. Ideal Skills: - Ability to create engaging, visually appealing logos - Experience in various logo design styles - Excellent communication to understand and execute my vision - Strong graphic design expertise Your portfolio showcasing your previous logo design work will be a critical factor in my hiring decision. Let's create something truly unique together!

As a burgeoning home decor export business, I'm seeking a skilled graphic designer, versatile enough to bring a breath of fresh creative ideas to houseware items. Primarily, your task will involve creating engaging and market-friendly designs for mugs, plates, kitchen canisters, barware, and more. While I am open to design styles, your work should be flexible enough to cater to a variety of aesthetics. Your responsibilities would also include: - Developing and presenting concept ideas for the artwork - Producing final designs in line with our specifications - Revising the designs based on feedback The ideal candidate has: - Proficiency in graphic design software - Experience in designing printable artwork for physical products - Open-mindedness to experiment with different s...

We have an existing 10 x 20 booth but we are taking a 20x20 space for our next event. Looking for a designer who can help us redesign our existing booth so that we can just change some graphics, incorporate in a few elements and make it look new.

I am in search of a proficient graphic designer with previous experience in creating infographics for Ayurvedic products. Your primary task will be to design high-quality infographics for a range of herbal supplements. These infographics should specifically aim to highlight the ingredients of the product, providing a professional and informative visual representation. Key Requirements: - Prior experience in designing infographics for Ayurvedic products - Strong understanding of Ayurvedic practices and ingredients - A professional and informative design approach - A keen eye for detail and ability to present information in a visually appealing manner The ideal candidate will not only possess the above skills and experience but also be able to deliver within agreed timelines and ...

Hola, quisiera un tutor/profesor para aprender a crear módulos en Odoo. Quisiera aprender creando módulos reales. Interesado en 2 o 3 veces por semana

Hola, quisiera aprender a desarrollar en Odoo. Necesito un profesor de Odoo, serían unas 3 sesiones semanales de 1 hora. Tengo conocimientos básicos de Python, y de creación de módulos en Odoo. Si te interesa por favor respóndeme con el precio que me cobrarías por hora.

Hello, I need a shopify developer and designer to redesign a product page for me. Thanks

I'm seeking a skilled freelancer to assist me with leveraging the free tier of Google Cloud ($300 credit) . I am a Google Cloud Platform account holder who wants to install and configure S/4HANA 2024. The primary goal for this project is development and testing. I'm looking for a freelancer who has a good understanding of both SAP S/4HANA 2020 and Google Cloud Platform. Your role will be to install and configure the software, ensuring it runs smoothly on the cloud platform. Key requirements include: - Expertise in SAP S/4HANA 2024 - Proficiency in Google Cloud Platform - Experience with installation and configuration processes - Ability to troubleshoot and offer post-installation support if necessary. Your assistance in this project will be highly appreciate...

I need the design verbiage to be changed to the following below and the new logos added Gattaca Florida Hurricanes 2024 Tryout Showcase Location: Burnett Middle School 1010 N Kingsway Rd Seffner, FL 33584 July 13th 2024 Time: Orientation: 12:00pm - Prospect Tryout: 1:00pm Looking for a new Professional Development Opportunity? The Gattaca Florida Hurricanes established in 2014 has a rich tradition of being a phenomenal platform for athletes to perform on The Gridiron. Gattaca Football has produced over a Hundred Collegiate Prospects during it’s time and the foundation of our program has even extended to the professional ranks such as The NFL and the AFL. If you’re an athlete with collegiate eligibility or an athlete looking to pursue the game at a higher level th...

...caracteres. Está prohibido usar IA, usamos programa para detectar si está realizado pir ia. El contenido tiene que ir directamente dirigido a una palabra clave, y se indicará palabras prohibidas según el curso. Por ejemplo, la palabra gratis. Todo el contenido se hace pensando em el posicionamiento. La persona interesada tiene que indicar un precio fijo por pregunta y otro precio fijo para el segundo punto. No hagáis una oferta para luego subirla, automáticamente la rechazamos Debido a la gran cantidad de ofertas, solicitamos lo anterior, que nos digáis directamente el precio por pregunta y por punto. Se requiere experiencia en seo, no en escritura. El trabajo son para unas 80 páginas, lo wue son 4...

I'm in need of a fashion graphic designer who can create minimalist designs tailored for adult audiences. These designs will be used on t-shirts, so it's essential that they make a strong fashion statement. Your main task will be to design graphics that are simple, yet highly appealing. Key requirements: - Expertise in fashion graphic design - Proficiency in creating minimalist designs - Understanding of adult fashion trends - Ability to create designs that make a strong fashion statement - Experience in designing for t-shirts is a plus. This project is perfect for you if you have a penchant for minimalistic designs and a firm grasp on adult fashion preferences. I'm excited to see your unique creations!

Se busca un modelo que sea capaz de analizar ficheros html de al menos 20mb y dada una descripcion de la tarea, generar un codigo html que cumpla con la funcion, por ejemplo: Rellenar con datos aleatorios el formulario de la pagina y pulsar el boton de registro. El modelo debe ser ejecutable en local y en la medida de lo posible liviano , tambien debe ser gratuito.

I'm in need of a creative designer to help bring to life 2-3 t-shirt designs. I'm looking for a freelancer who can deliver the designs in the proper file format for printing. I have attached an example of what I am looking for that I made with AI but it's misspelled. I basically want a kettlebell with an alarm ⏰ clock in it. I want Tribe 5 am on top of the clock, and Wait-List Crew on the bottom. Somewhere in the middle this logo (attached) Key Requirements: - Proficient in designing t-shirt artwork - Ability to come up with creative and original designs - Familiar with the technicalities of creating files for printing - A good communicator who can understand and deliver on my requirements In your application, please include a detailed project proposal that ...

Job Title: Web Designer (Figma Expert) Description: We are seeking a talented web designer with expertise in Figma to join our team for various web design projects. While your primary role will be web design, the ability to create simple banners and other smaller visual elements for websites is a significant plus. Project Details: - First Project: Design a homepage for a casino website, including footer and header. - Content: The homepage will feature a substantial amount of content (approximately 20,000 words). - Visual Requirements: Each H2 heading (around 40 in total) will need a corresponding image. These images can range from banners to other types that visually complement the content. Unique images should be created using Google Translate to fit each heading’s...

...diapositivas en español para educación secundaria sobre el tema de la contaminación del aire. Aquí están los detalles que debes saber: - Nivel educativo: Las diapositivas están destinadas a estudiantes de secundaria, por lo que el lenguaje y el contenido deben ser adecuados para este grupo de edad. - Enfoque del tema: El enfoque principal de las diapositivas debe ser la contaminación del aire. Esto incluye comprender las causas, los efectos y las posibles soluciones a este problema ambiental. - Elementos multimedia: Me gustaría que las diapositivas fueran visualmente atractivas. Por lo tanto, el uso de imágenes y gráficos para explicar conceptos clave y enfatizar el impacto de la contaminación de...