The difficulty is that the increasing dollar value of Bitcoin incentivises more mining activity (even though no additional coins will be produced as a result),

The difficulty is that the increasing dollar value of Bitcoin incentivises more mining activity (even though no additional coins will be produced as a result), so energy use is almost directly correlated with the price, at least in the medium term. Fortunately as the block mining reward continues to be halved approximately every four years, the incentive to mine will decrease as well (though not quite as much, because miners also receive transaction fees).