It changes the composition of the forest to make it more flammable.
I don’t understand your coral comment. The coral expels the algae because the temp causes it to expel harmful toxins. There are other triggers besides heat.
But... basically any human activity changes forest composition.
Only 30% of the forests are primeval, and those 30% are not in Europe.
Forests are not "natural" for thousands of years.
>There are other triggers besides heat.
The amount of studies (or corals and algae) seems to be insufficient. I clearly remember the alarmist wave of the 2016, which turned out to be, well, not entirely unjustified, but clearly exaggerated.
That isn't science that is some activists opinion and the amount of forests actually sprayed with glyphosate is not the majority or even close yet we still have wild fires. The article linked is mostly nonsense with regards to wild fires, it may have some validity for the areas sprayed regarding biodiversity.
I'm not a fan of Glyphosate but it's just not used enough in forests to be a primary factor in wildfires. Additionally, in the article you link, they are really reaching and again, this is just their activist opinion (chemicals bad! ok) and I don't see any actual studies on the topic.
Bleaching happens when the symbiosis breaks down due to elevated temps. That is due to suffering and causes suffering.