There are a lot of room for improvement in using energy better. Cars do not need to spend so much fuel as before, and there is room for improvement in isolation of houses so they don't need so much energy.
None of those are related with nuclear energy but would reduce the climatic problem just now, not in ten years, without putting a low probability but catastrophic collateral effect in the middle of the road for our grandsons.
In any case with or without nuclear, with the highest wildfires registered in the history in Russia, Australia, Brazil and US (2019-2020) we either focus and solve the arsonism crimes, predatory logging, and environmental lack of water problems or we aren't going anywhere. Deliberate arsonism should be reclassified worldwide as crime against (the future of) humanity. If we can bomb a whole city in Irak, we should be able to drop water in California or Canberra.