I did wonder what the effect on CO₂ the lock-downs would have.
Air travel, cars etc. But I would posit there would be an increase in electricity consumption for several reasons. Stuck at home, people would use the TV & computer/internet far more, and server farms servicing that need would be more active. Given the novelty of the situation, people would concentrate more on just getting through this, than say being carful.

Mostly fueled by sever farms & bitcoin mining, but computers are drinking a sizeable amount of electricity.

So less of a saving than you would think.