For smallholder farmers in India, agriculture has long been an unreliable source of income -- crops that flourish one season can fail the next, thanks to heat, pests and disease. But climate risk is now making the profession nearly impossible. TED Fellow Sathya Raghu Mokkapati is determined to change that with "greenhouse-in-a-box": a small, low-cost, easy-to-build structure aimed at helping farmers weather sizzling summers, increase monthly revenues and grow more food with less water.