I think I get the point you're making but climate change will fuck over the same people who end up getting fucked over by war.
As is often the case, the wealthiest can deal with the side effects of climate change. The ones who will be most affected by famines and natural disasters are the poorest, most marginalised, most deprived.
I suspect it'll make conflict more likely, not less.
Games publishers are in a war of attention and don't want to compete with themselves. They won't sell you an old game if they can get you hooked on the new version with microtransactions and DLC with no story and sub-par multiplayer.
The next point is just making the case for open source.