Your Own Backyard (Even if you don't have one!)
There are crazy technologies like electronic printers that actually print food, but perhaps some of the most promising developments have come from the simpler ideas: people growing more of their own food, for example, even if they live in tight quarters with little green space or in urban environments. Urban and vertical farming, growing foods in containers that you'd never thought possible, or even gardening on-the-go can all go a long way to making people, wherever they are, more self-sustainable, which -- as people strive for a more locally-sourced, less fossil fuel-dependent food supply -- will be a key part to feeding the future.
Climate change is the defining issue of our time, and this is a defining moment of history. HowStuffWorks lists 10 things you can do to help Earth.