Ain't going to happen, sadly. As the temperate zone moves closer to the world's poles, and the regions we're currently growing cereal crops on become progressively more arid, there is simply less area of land (square miles or kilometres or however you want to measure it) on which crops can be grown - and that's ignoring the costs of clearing and draining that land, and all the effects of ecocide.
At the same time as this is happening, of course, all our critical infrastructure will become unusable unless we make huge new investments in flood walls. For example, I work for a major international bank, which, obviously, has its critical data infrastructure replicated in seven cities across the globe. Only one problem: in six of those seven cities, our data centres are within ten metres of current sea level. Most major financial centres are old port cities, and all old port cities are on the coast. So over the next fifty years we have to either all relocate our trading infrastructure, or else abandon it. What I expect will happen is that we'll delay and dawdle until it's too late, and then our whole civilisation will collapse under the combined pressures of hunger, refugees, and rising water levels.
We're already past the point where there's any hope of the planet being able to support even half its current population in 100 years time. The real policy question is how we now radically reduce the population without war, pestilence, famine and death.