“Carbon capture” is the new holy grail of scientists working on climate change strategies. How do we soak up the carbon we’ve been releasing into the atmosphere, fueling global warming? High-tech innovation is one approach – but low-cost, low-tech approaches might be just as valuable, if not more so. Across Mali and Burkina Faso poor farmers have been turning the desert back to productive farmland by planting trees and improving soils. Earth Report explores the key role they’re playing in the battle against climate change.