Open-pit mines can be rehabilitated and depending on the environment it can be done pretty quickly. I've visited an old open-pit mine in the Philippines that closed not too long ago. The jungle and farmers have quickly reclaimed the area. Try doing that in an area bathed in radiation that has the ability to spread via air and sea currents. I'm not for open-pit mining, definitely not for fossil fuels and 100% against nuclear energy in its current form. Once we perfect fusion-based reactions I will probably rethink my position, but I won't change my view on fission-based reactors.
Firstly, fusion is not "clean" it produces enormous amounts of neutrons, just like fission power plant, in order to generate heat. Bombarding any element with neutrons moves it to an unstable high energy state. So you 100% get radioactive elements out of a fusion reactor. No doubt about it. Those elements are not as long lived as some of the transuranic elements from a fission reactor, but the most dangerous elements from a fission reactor is actually the short lived ones (the shorter the half-life the more energy it gives off in a short amount of time).
Secondly, fusion reactors have a fundamental problem, in that they require containing a reaction that happens at heat levels that no material can withstand. In fact you need that heat level just for the reaction to be possible. Fundamentally why fission is so much simpler, it doesn't need heat for the reaction to be possible. And that fundamental problem is why it is taking so long and why creating a commercial and cost effect reactor is probably likely to never be a reality. At best you can create a reactor that is incredible expensive.
Once they actually realize one of these reactors, inevitable one will blow up and release radioactive material into the atmosphere and it'll be fission all over again. (OMG IT IS SO UNSAFE WEWEWEWEWE)
Lastly global warning is a reality. Even if you don't believe it is a reality, the consequence of being wrong is so severe that it is stupid to even take the risk. Using fission until something more viable is available is far more realistic than pinning your hopes on something that may not materialize ever. And more importantly it has enormous benefit of doing something about global warming while we still are able to do so.