I agree this is convenient, but the whole thing sounds far fetched. Since it is the enviros that pushed Biden to make this policy and campaign promise, you'd have to believe that Buffett planted the idea in their heads, too. As far as donating to the Biden campaign, Buffett is far from the only billionaire in America that hates Trump. Bidens policies will probably benefit some of the others, too. So as far as Buffett being a rich guy who sees self benefit in giving Biden money and in Biden winning: seems very likely. As far as killing keystone being a quid pro quo, seems doubtful.