Support political candidates and run for office in order to put those who understand the science behind and believe in climate change and who will commit to policy to contribute towards solutions (and tilt the scales away from fossil fuels). Otherwise everyone working towards the cause is swimming upstream.
The gigantic problem is that we can’t. Old people have by far the most voting power.
And in the US those seem to be pretty securely glued to their TVs running Fox News (I know my american relatives were).
Imagine that one of the many nuclear zealots on HN invents a nuclear plant that is cheaper than fossil fuels, but only if you include the cost of carbon externalities? They wouldn't be able to build a business on that without societal support.
SPOILER: existing nuclear plants are already cheaper than fossil fuels with reasonable carbon fees [1]. Why haven't they been rolled out more? Because carbon fees have been fought by fossil fuel interests who spend a lot of money convincing young people that it was all the treehuggers fault.
1. https://www.oecd-nea.org/jcms/pl_14674/carbon-pricing-power-...
As long as these young people vote out the climate change deniers, and society get serious about not rewarding people who generate externalities there will be jobs aplenty, that will be taken by people who just want the money. If they don't then it won't matter what they do.