Driving too the cinema to watch a movie produces more CO2 than watch one movie online but online makes it more convenient so you watch more. That sums up to more CO2 emission.
The point is that higher efficency is wortless in terms of CO2 emissions if it leads to higher usage that compensates for the savings.
If a programmer can program faster with AI it's good if he only needs 1 hour instead of 8 but if he still programs 8 hours a day AI's energy consumption comes just on top of his previos consumption.
Climate change doesn't care how efficient you produce more CO2, more is simply more.
