Earth Day Quiz #3: Exercise Your Eco-Muscles

Who was the first scientist to explain how global warming works? Is Apple or HP more sustainable? Find out those answers and more in today’s Earth Day quiz, and remember — anyone who gives it a try is entered to win a free T-shirt or sticker. Good luck!


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  1. Pingback: Earth911 Quiz #52: One Year, 10 Questions | Earth911.com

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