Take hot desert areas next to the sea that is a bit windy, with waves and tides where no one currently lives.
Must be hundreds of suitable locations around the planet.
Plant loads of Boeing Stirling Engines and similar CSP units, snakes, wind turbines and wind kites and similar.
Use saltwater as a medium for the csp units, get four bi products – electricity, distilled water, petrol and fertilisers.
Build hightech ecocities with universities and agriculture.
Add in algae methods of getting oil.
Use effects of forest and wind to grow more forest.
Result – a sustainable planet.