The head of the Australian energy market operator AEMO, Daniel Westerman, has rejected nuclear power as a way to replace Australia’s ageing coal-fired power stations, arguing that it is too slow and too expensive. In addition, baseload power sources are not competitive in a grid dominated by wind and solar energy anyway.
We now have the technology to alter the trajectories of asteroids (tested on the DART mission), and have a fairly comprehensive catalogue of the big ones. I don’t expect this to be an issue.