A lot of hydroelectric depends on snow pack and glacier runoff that is being adversely affected by global warming. Solar and wind are the only robust hedges against a warm up that might ultimately severely curtail river flow.

We have a lot of uranium and nuclear is fairly renewable at least in the span of a few centuries. The waste issue is a problem.

Nuclear waste is not a huge problem. It's mass is tiny, and it can be contained safely in very small areas