This video is a great example of the power of smart permaculture design to restore ecosystems. The first 5 minutes or so are from the original; the rest is an update. Definitely watch the first 5 minutes, it's amazing:
Permaculture is a going to continue to be increasingly important in creating food systems that don't contribute to climate change, soil degradation, ecosystem destruction, food price spikes, and other sustainability issues, and are also resilient in the face of climate change impacts that threaten our current food systems.
And it's something that everyone can (and should!) do in their backyard, balcony, windowsill... Learn more at the links here.