Some of mine:
Build extremely tall wind turbines, tall enough to reach the jet stream which is extremely windy.
REQUIRE structures to have solar panels on their roofs.
Create some kind of a filter which will be placed on the exhault pipe of cars and stops the greenhouse gasses from being emitted
Stop drilling for oil, and invest our science in discovering natural fuels
Drill extremely deep into the earth and use it’s thermal power to generate our own power
Stop using paper, and invent some kind of electronic device which will act as a notebook for schools, and plant millions of trees.
Also, open a lot more plants which desalinize natural sea water and make it drinkable
