The scientists in the article point out that the big reduction is only for full time work from home, and that the net effect might not be a negative reduction.

The main causes of remote workers’ reduced emissions were less office energy use, as well as fewer emissions from a daily commute.

A concern is that if everybody is staying in a less energy efficient house than an office building then it might be an overall increase in energy use.

I’m of the opinion that the mental health benefits outweigh all of this though.