Fossil fuel advertisers and climate change denial financers.
Climate - truthful information about climate, related activism and politics.
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.
So mainly producers
If producers were forced to account for all emissions, either they wouldn't exist or oil and gas would be charged for what it actually costs, buyers would happily switch to cheaper renewables when possible, and a lot of plastic junk just wouldn't get made.
The fault lays at the feet of producers and the politicians they bought.