Electrification of transportation, heating, and various industrial processes is crucial to fighting the climate crisis. Of course that’s only true if we wind up generating that electricity without carbon emissions. Renewable energy, including wind, hydro and solar will play a big role in this. Yet there are many reasons why those alone are unlikely to get us there, which is why we urgently need to build out other alternatives as well, such as geothermal and nuclear energy. In nuclear it makes sense for us to fund fusion, to see if we can make that work, but a possible commercial fusion reactor appears too far off to mitigate the worst of climate change. We should be building fission reactors to provide zero carbon electricity, because we understand the technology and have the industrial capability to do it in time to reach net zero by 2050.