Scientists and engineers can make major contributions by developing technologies that produce less pollution and waste and that preclude ecosystem degradation.<br /><br />Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! <br /><br />Donate or volunteer today! Donate here: <a href="https://www.khanacademy.org/donate" target="_blank" rel="nofollow">https://www.khanacademy.org/donate</a><br /><br /> Volunteer here: <a href="https://www.khanacademy.org/contribute" target="_blank" rel="nofollow">https://www.khanacademy.org/contribute</a><br /><br />Credits:<br /> "Bananas" by Elembis [Public domain], via Wikimedia Commons:<br /><a href="https://commons.wikimedia.org/wiki/File" target="_blank" rel="nofollow">https://commons.wikimedia.org/wiki/File</a>:Bananas.svg<br /><br />"Gobabeb solar panels" by GbbIT, licensed under a Creative Commons Attribution License (CC BY-SA 3.0):<br /><a href="https://commons.wikimedia.org/wiki/File" target="_blank" rel="nofollow">https://commons.wikimedia.org/wiki/File</a>:Gobabeb_solar_panels.jpg<br /><a href="https://creativecommons.org/licenses/by-sa/3.0/deed.en" target="_blank" rel="nofollow">https://creativecommons.org/licenses/by-sa/3.0/deed.en</a><br /><br />"Wind Mill of Bangui, Ilocos Norte" by JufelBaldado, licensed under a Creative Commons Attribution License (CC BY-SA 3.0):<br /><a href="https://commons.wikimedia.org/wiki/File" target="_blank" rel="nofollow">https://commons.wikimedia.org/wiki/File</a>:Wind_Mill_of_Bangui,_Ilocos_Norte.jpg<br /><a href="https://creativecommons.org/licenses/by-sa/3.0/deed.en" target="_blank" rel="nofollow">https://creativecommons.org/licenses/by-sa/3.0/deed.en</a><br />...<br /><a href="https://www.youtube.com/watch?v=FIYVnvHa2dc" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=FIYVnvHa2dc</a><br />Note: All Khan Academy content is available for free at (www.khanacademy.org)