Compared to the rest of the world, people in the US really lag behind in their knowledge of climate change. And a new survey done by Yale University's Project on Climate Change Communication shows that American teens knowledge of climate change generally trails that of adults--just 25% of teens received a passing score in the survey, compared to 30% of adults. Sigh. The good news in this (barely)? Roughly two-thirds of both adults and teens say that switching to renewable energy will reduce global warming either some or a lot. And while two-thirds of adults can correctly identify what the greenhouse effect is, 77% of teens can.