We often look to the sky for climate solutions. We debate carbon markets , map wind patterns , and calculate atmospheric emissions . Yet one of the most transformative, sophisticated solutions to climate change available to us is not engineered in a laboratory—it is the living soil right beneath our feet.  For far too long, humanity has treated soil like dirt: an inert and seemingly inexhaustible resource to be relentlessly plowed, sprayed, or paved over. What is often overlooked is that soil is humanity’s lifeline. Each handful of healthy soil contains more living organisms than there are people on the planet.…