Surrrrrrrrrrrrrre, just tell everyone to stop breeding and to plan on doing with less because one day it will all run out, and they will be happy to oblige. Best will be corprations, because profit margins are just sooooooooo overrated. They'll probably be giddy to tell people with their ads not to buy so that 50 years from now someone can buy their corn syrup soda instead.
And of course, you'll be glad to cut back when you're 75, but not today, eh?
Rice takes a lot of water to grow, and with the Ogallala Aquifer set to run dry, most of the world will not have enough to eat in half a century. Everyone's going to die anyways, the heck they care about what happens 20 years from now.