Such a large and broad topic.
First I’m going to track down all the oligarchy who have been pulling all the strings and isolate them in a happy camp, to prevent them meddling with their perverse ideas.
All the very large for-profit corporations that adversely affect the planet are going to have their charters revised so that they serve good purposes rather than just profit and stock value, and strive to avoid causing harm to others (including non-humans). This means almost all of their executive leadership, lobbyists and bought politicians should be replaced (and some of them sent to the happy camp, or at least an eye will be kept on what they get up to).
Non-humans are going to start getting treated more like humans in terms of rights to life, liberty and happiness, and their (and our) ecosystems are going to be recognized as unique, irreplaceable, and essential, and in need of protection and restoration. That of course requires treating climate science seriously and making the future health of the planet more important than industrial practices that threaten them.
“Oh no! What about our hard-earned stock portfolios and jobs?” I expect some people may say…. well, we’ll be replacing the “if you don’t have money, you get no food/shelter/medicine/etc” deal. I’m not going into details on that here, but it’ll work out.