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 As someone else mentioned, I was also amazed by the amount of people that will populate the earth by 2050.  I think that we need a change in how we consume food, because most of it is processed food that we eat too much of, which I am certainly guilty of (there's a stash of Whoppers in the bottom drawer of my desk).  If we or the government begin to emphasize eating healthier foods, the demand will go up and lower the costs, solving the problem of lower income people who can only afford cheap processed foods.  I think the main reason for the problem is that people can't fully understand the effects of something that is so far in the future.  This is also the case for so many government issues, from climate change to the economic reform policies.