Why is this issue political?
I think at one point I've read an assassment along the lines of "leftists got there first in adopting it as cause which made it harder for the conservative movement to jump on the bandwaggon, due to political tribalism".
The reason why leftists beat conservatives to it is because strict measures to combat climate change usually hurts (or at least forces them to adopt radical change) traditional industries like fossil fuels or automobiles and since conservatives tend to be pro-business they're at the very least reluctant not to protect these businesses. Strictly speaking, climate change measures also leads to subsidization and protection of certain industries like renewable energies, emission free automobiles, or public transport. But since those industries either didn"t exist in the beginning of the climate change debate or were not as poqerful as the other ones, the priority for pro-business conservatives lay on "protecting" the former. So, it also played a role that maintaining the status quo appeared as the safer and easier route compared to transformation, particularly since conservatives are believers in the free market as opposed to government intervention.
That being said, the ideological split between conservatives and leftists on climate change is much more severe in America than it is in Europe. Mainstream conservatives in Europe tend not not question the existence of human-made climate change and they also support implementing measures to halt climate change, although usually not to the same wide-ranging extent as leftists. Outright climate change denial is more the domain of right-wing populists and the far-right in Europe.
Why this difference to America? Maybe because European conservatives are by nature less pro-free market and more interventionist than their American counterparts due to the existence of the European welfare state. And it's also possible that the fossil fuel and automobile industry has been slightly less powerful in Europe due to America being a more automobile-centered culture with less emphasis on public transportation (which in turn is probably a result of America being a much bigger country with more areas which have a rather low population density).
And last but not least, the two-party system in America means that basically all right-of-center movements and ideologies were lumped together into single political party (with the climate change denial faction then growing and taking over that party), while im Europe these camps are segregated im mainstrem conservative and right-wing populiat parties which lead to a containment of climate change denial ideologies.