Oil companies ARE responsible for the worlds environmental problems.
Make them pay
This is a war they're not going to lose, they're just trying to win every chance they get. The fossil fuel industry makes a trillion dollars of profit a year. They could buy every politician so many times over.
It's a war they will definitely lose, either by time or by collective will. I hope it's the latter, because if it's the former, nobody wins.
TLDR; if the EPA bites the dust, every state lawsuit against polluters can go through.
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.