the tech is already there but we have entrenched capitalists that will not give up their control so easily.Have you figured out how to make the biggest polluters, China and India, go green? Have you figured out how places with large populations like the U.S. Northeast and Germany, where the sun doesn't shine much of the year and aren't windy, are supposed to exist on wind and solar power? Have you figured out how we run things on solar when it is dark half of the day and we don't have but a fraction of the battery storage needed to run things in the dark and there's not enough lithium in the world to power the U.S. let alone the rest of the planet? What exactly would you have us do, kill everyone down to a fraction of the population to "save" the world? The future for billions of people still includes fossil fuels. We can use green tech to generate power but it alone won't cut it. It will take some new tech discovery to get off fossil fuels but until then trying to completely force us off it will end in disaster.

The 10 most polluting countries per capita, according to new UN report
And you might be surprised by number one
btw this system will lead to the death of our species
i would say public transportation, consumer goods has to be fixable and upgradable, sustainable diets, and ending the war machines world wide including nukes would be a good start.