The air around the Earth is like a big invisible blanket. Some gases, called greenhouse gases, keep our planet warm. That sounds great, but too many of them can make the Earth too hot.

Look at this pie chart of U.S. greenhouse gas emissions. Shade each slice in a different color, then answer two questions. Next, use the same color key to match actions we can take to reduce greenhouse gases. Finally, pick the correct answer about why greenhouse gases make the Earth warm, and share your thoughts on whether wind turbines are a good source of electricity.