This is the only answer. End of discussion. My personal pet conspiracy is that every other major issue in politics is a smoke screen for the wealthy and politically powerful to consolidate power in preparation for the unavoidable shift in economics that will take place when we're so fucked we can't feed ourselves. It's less a pet theory than a plot for a book I have no idea how to write but it would be a damn good book if I was talented and motivated enough to write it.
That's a pretty wide scope for a book. I'd write a book about something else. Like a story about a hacker that gets caught up stealing information from megacorporations. Then in the background of the story you see the wealthy consolidating power and climate change happening. That'd be easier than writing a straight up story about wealthy consolidating power.