/ Quizzes Global Warming Quiz Do you know what is making Earth warmer? Read more about Earth Day! Question 1 (out of 10): Which of the following is a greenhouse gas that is released by human activities and speeds up global warming? petroleum natural gas carbon dioxide nuclear power More Quizzes from Factmonster: Try another Science Quiz ! Quiz Archive FEN Learning is part of Sandbox Networks, a digital learning company that operates education services and products for the 21st century.