This is such an important TED talk! So many people, including myself, do not realize the effect that something as vital as agriculture has on the planet. We need to practice more efficient agriculture, and we need to act quickly. Some examples of potential solutions are vertical farming, buying more locally grown foods, dramatically altering our diets, and growing food ourselves. Even in urban settings, more and more people are realizing that not only is growing their own food fun, it is healthier for themselves and for the Earth.
You can also refer to one of my earlier posts, Edible Landscapes, for more information regarding solutions.