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.
A decent mail program would at least offer you the option to just display the signature with the first mail. But maybe the company mandates to do it in every mail. In any case, damn.