Profitability and convenience.
Climate
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:

How much each change to the atmosphere has warmed the world:

Recommended actions to cut greenhouse gas emissions in the near future:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.
“It is difficult to get a man to understand something, when his salary depends upon his not understanding it!”
- Upton Sinclair
Well, there’s been decades of warning about dependency on Russian gas too. Complacency
Some of it was even intentional (at least Germany).
[muffled Gerhard Schröder noises in the distance]
"But it's expensive to build houses with IR emissive paint on the walls and roof, that money could be spent on buying insulation made out of petrochemicals."
Same reason I spent many evenings frantically completing projects the day before they were due despite being given weeks or months to prepare: why do something now when you don't technically need to do it until later?
Dumb bitch juice.