We are currently producing enough food to feed the highest population the Earth is expected to ever at any point have. We are doing so in perfectly sustainable fashion. Malthus is dead.

Edit: For clarity, the sustainable fashion I refer to may involve shifts to less meat consumption, between different sorts of crops, or the substitution of machinery with more labour, to deal with various future crises. Modern crops and farming knowledge alone, which should both survive even a collapse of civilization largely intact, ought to be enough to feed any projected human population. It's theoretically possible for Mathus to come back, but the conditions that would lead to it are so unlikely that for the purposes of ordinary debate it can safely be said to be a fixed problem.