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We have all the technology already to get rid of oil dependency, but for now oil is still the cheapest solution. Oil won't run out over night, it will get harder to come by and prices will start to rise more and more.
That will make the alternatives more attractive by comparison, making us less dependent on oil, pump more money into refining alternative energy technologies, making it more affordable for everybody. It will balance out in the end.

I don't know if a food crisis will happen. The climate also doesn't change over night. Food production will migrate to the best places to grow it. There's plenty of 'new' ground becoming available when the vast north of Canada and Russia become more habitable. And all those old turned to desert farms can be converted to produce solar energy.

The world will change, people will adapt. As long as we don't boil off the oceans we'll survive. Who knows, Africa might become the world leader in exporting cheap hydrogen fuel made with solar power and sea water pumped in along the coast. Pump sea water through the oil pipe lines to convert to hydrogen, oxygen and salt as a by product. Import food grown in Syberia.

It will be smart to do something about overpopulation, and the best way to do that is to invest in developing the rest of the world. People in 'first' world countries are too busy with careers to have a lot of children and their population would be shrinking without immigration.