>>1721864Yeah: nuclear fission
Geothermal works for small countries like Iceland, but wouldn't be suited to fill the energy demand of larger nations. Solar and Wind aren't viable yet because the power output is uncontrollable, which means you need peaking plants (which use a controllable source) and/or large-scale storage to power the grid when the sun isn't shining and the wind isn't blowing. Battery storage is too expensive, pumped hydro storage is impractical on the scale we're talking about, and everything else is still in development.
Nuclear is one of the cleanest and by far the safest power source, but it gets a bad rap because the few accidents that have happened (namely Chernobyl, TMI, and Fukishima) are extremely high profile. You never hear about the thousands of deadly refinery explosions and coal-mine collapses, that have killed tens of thousands, but everyone knows about Three Mile Island, where zero people were injured and zero radioactive material was released.
We've had a practical solution to climate change for 60 years, but local governments fight every new nuclear plant tooth and nail because "muh radeeashun"