Edit: A lot of people seem to hate on the article without reading it.
Here is a supporting scientific source, by the same author: https://www.sciencedirect.com/science/article/pii/S2666188825000863
The environmental impact of our online habits is far larger than most realize, and as digital communication continues to evolve, we must consider its long-term consequences on the environment and human life. We should take the easy steps of cutting wasteful energy use in our communications and it can start with eliminating email signatures.
I’m old though to remember that rich text email or just more than 4 lines/72 columns of signature was a blatant violation of netiquette. I’m also old enough to remember there was such a thing as netiquette.