I don't know for sure whether nuclear plants can be built fast enough so I can't really agree or disagree with you there, but while I do certainly agree that we

I don't know for sure whether nuclear plants can be built fast enough so I can't really agree or disagree with you there, but while I do certainly agree that we need to curtail consumption of fossil fuels yesterday, so far it looks like that curtailing gets us at most 8% (we're not going to get a stronger example than cancelling air and most car traffic in all of the most pollutive-per-capita countries: nobody would go follow such measures if it weren't for a pandemic but for a potential extinction event more than a year in the future). We need more than 8%, way more.