WASHINGTON (AP) — Global warming has mostly made the weather more pleasant for Americans over the last 40 years, which may explain why much of the public doesn’t rank climate change as big a threat as do scientists and the rest of the world, a new study suggests.

But that perceived benefit of global warming — mostly milder winters — will soon be outweighed by more oppressive summer heat, according to a study in the journal Nature that’s dividing the scientific community.