This is really it in a nutshell. When it comes to the environment the difference between republicans and democrats (meaning leadership long entrenched in power, not individuals who identify one way or the other) is that democrats pay lip service to the issue while republicans largely don't. In all Obama's delays and roadblocks of pipelines, not once did he take real steps to guarantee that the opportunity wasn't there for the next president to restart and finish things. Indeed, for both Keystone and Dakota Access only the final stretches and tie-ins remained for Trump to authorize. The vast lion's share of the work had been done already. And nothing substantial has been done about ocean trash.

We can debate environmental policy, but surely we can all agree that neither party has actually done a whole lot to effect real change. As AKJeff64 alludes to, there are lots of democratic billionaires out there. Neither party is ultimately going to upset the apple cart that feeds them.