Young Americans express the greatest concerns about climate change, and are particularly likely to take action in response. Roughly half of young Americans aged 18-34 (49%) say that they are “very” or “extremely” concerned about climate change, which is the highest of any age group. Additionally, 18-34 year-olds are far less likely than other age groups to dismiss the problem by saying that they are “not very” or “not at all concerned” about it (just 13%). Close to two-thirds of Americans aged 18-34 (64%) also say that they’ve taken some form of action to address their concerns about climate change, which is considerably higher than average. Democrats care the most intensely about climate change, but most Republicans also have some concerns about it. Around three-quarters of Democrats (74%) are “very” or “extremely” concerned about climate change, compared to just 29% of Republicans.