This is quite surely about some combination of greenwashing and desire to have a seat at the table to interfere with negotiations, rather than any kind of sincere desire to go along with decarbonization.
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Still, if they can convince him to keep the US in the agreement, that’s better than the alternative. Though my hopes here are not high.
Alas, they’d have a seat at the table anyways, considering how large and global they are - they could for example push through their ExxonMobile Canada affiliate, or through one or several of their European ones.