Water pollution remains Americans’ top environmental concern. Record-high numbers of Americans see climate change as a “serious threat” to them personally and say that its effects are already happening. 63% of Americans recognize that the effects of global warming have already begun, a record high in Gallup’s tracking. 48% of Americans expect that global warming will pose a “serious threat” to them in their lifetime, a record high in Gallup’s tracking. 57% of Americans say that the country is doing too little to protect the environment, compared to just 11% who say that the country is doing too much.