Once the population reaches ~10 billion the problems will solve themselves.
Even this grim poverty-stricken dystopia, though, is not the biggest of the WWF demands. The real biggy is that by the year 2050 all energy is to be supplied in the form of renewables-generated electricity, that is by means of windfarms, solar plants, tidal barriers and so forth. For almost all of human history and prehistory we have burned things to generate energy - it is one of the things that makes us human - but now, within a single generation, that is to almost completely stop. After a million years, the fires will go out.
Your Personal Pinwheel will supply power for your (allowable) needs...and, as an added bonus, it also slices and dices...and cooking is not among them: communal kitchens (cf "Amana Colonies") will be the norm, but handing out glops of uncooked gruel & and raw veggies, instead of good German meals.