Dunno about parties, but multiple eco-focused organisations are paid at least in part by oil & gas. Greenpeace actually founded a gas-providing energy utility in Germany (Greenpeace Energy, recently renamed Green Planet Energy to… avoid headlines about Greenpeace selling gas, despite those headlines being true). Other orgs got more direct funding from oil & gas players e.g. FoEI was literally founded with an oil baron's donation, and Sierra Club got millions recently from drilling & fracking company Chesapeake Energy.

Both Greenpeace and FoEI were actually founded by Sierra Club members who thought Sierra was not anti-nuclear enough. After a while, Sierra's platform changed to be more anti-nuclear (its current position).

And don't discount funding from Russia, that goes really well with both Russia's destabilisation goals and anti-coal campaigns leading to higher dependence on Russian natural gas.