Respectfully, I don't think this is true. I've looked at several sources and coal only amounts to about 12% of European electricity production, and that number has been steadily dropping.
Also. I am not an expert on this next point, but I suspect diesels are not as clean as you think. Sure maybe during laboratory tests in ideal conditions they can do okay, when the engines are new and properly maintained and driven efficiently (and sometimes when manufacturers cheat on the tests, eg dieselgate). But in real world conditions, when engines are old and/or cold, it's a different story. Where I live, diesels are rare, but when I visit places where diesels are common, the city air literally stinks of diesel fumes.
I have no agenda re: electric cars, I don't own one and I don't particularly want one, but I do feel obliged to try to correct misinformation. Anyone please correct me if I'm the wrong one here.
My source for the 12% is
https://www.iea.org/regions/europe/emissions