> Hydropower is generally renewable but really is not considered sustainable.

Unfamiliar readers have to note that here sustainable is not used in its normal meaning but in the one used by some environmentalists. Hydropower can definitely be sustained indefinitely. It does cause flooding in some area previously I flooded and disturbs fish which some people view as an issue.

It’s really hard to have a good discussion about climate change because some people constantly push unrelated agenda into the mix.