It wasn't always as partisan in the United States as it is now. It's likely there are multiple reasons for this, but I think one that's underappreciated is that

It wasn't always as partisan in the United States as it is now. It's likely there are multiple reasons for this, but I think one that's underappreciated is that the actions available to us today for slowing or stopping climate change are basically limited to reducing consumption in general and energy consumption in particular -- and that these happen to align with preexisting policy preferences of some on the "left". Additionally, industries focused on carbon extraction have long been aligned in the US with the Republican party and these industries would feel the greatest sting from efforts to reduce consumption. Over the past two decades, the dialog has shifted a bit along lines like "the Earth isn't getting warmer, and if it is then it's not humans that are responsible and if they are then we can't do anything about it anyway" which feels to me like the "truth" being projected is whatever doesn't require any action. Human nature being what it is, it's debatable whether any effort aimed at changing people's behavior could ever be successful, and trying to make them feel bad about it may even be counterproductive. On the whole (and echoing another comment), you're not likely to get reliable information about climate change from any generalist source of information. Every time there's a slightly unusual weather event, there are a brigade of voices trying to tie it to climate change. Actual researchers understand that you simply can't ascribe individual events in that fashion; the best you can do is to look at trends and try honestly to look at all possible factors for them. Forest fires are in the US seem to be getting worse, and it's probable that some amount of that is a direct or indirect result of climate change. But there have also been a lot of changes in forestry management over the last century, and an increase in the number of people living in affected areas -- and both of these clearly have some role in our perception too.