Anybody with a garden could grow their own food, or atleast part of it, in the form of vegetable patches or fruit plants/trees... even those without gardens could do some growing in plant pots. Small things such as tomatoes or beans work well like this and afterall even if it is on a small scale it helps to alleviate the problem especially if we all did it, take a look at this http://www.onepotpledge.org/getgrowing.html another advantage of that is that ultimately it also save you money and it tastes better.
Another thing that would help along similar lines is by trying to make sure that as much space in our cities and towns are used to grow gardens, by this I mean on the roofs of suitable buildings and such. I suppose one of the best things we could do would be to 'keep bees' in such places (although I understand how that might be undesirable in its own way) too because we really don't want them becoming endagered or even extinct.
http://www.zeitnews.org/agriculture-research/
http://www.renewable-energy-news.info/benefits-of-green-roofs/
Quite Ironically those two links popped up when I searched 'roofs' because it just didn't look right and just happened to be relevent what I was writing about.
Ofcourse there are larger scale more industrious ways to produce more food such as 'Hydroponics' or 'Vertical Farming' these are two different methods that promise greater yeilds all year round and are a far more efficient use of space. You see the problem right now isn't so much that we are running out of space it is that we aren't using the space we have to its maximum potential.
