Author: Rob Jordan | Published: October 5, 2017
If you want to do something about global warming, look under your feet. Managed well, soil’s ability to trap carbon dioxide is potentially much greater than previously estimated, according to Stanford researchers who claim the resource could “significantly” offset increasing global emissions. They call for a reversal of federal cutbacks to related research programs to learn more about this valuable resource.
The work, published in two overlapping papers Oct. 5 in Annual Review of Ecology, Evolution and Systematics and Global Change Biology, emphasizes the need for more research into how soil – if managed well – could mitigate a rapidly changing climate.
“Dirt is not exciting to most people,” said Earth system science professor Rob Jackson, lead author of the Annual Review of Ecology, Evolution and Systematics article and co-author of the Global Change Biology paper. “But it is a no-risk climate solution with big co-benefits. Fostering soil health protects food security and builds resilience to droughts, floods and urbanization.”
Humble, yet mighty
Organic matter in soil, such as decomposing plant and animal residues, stores more carbon than do plants and the atmosphere combined. Unfortunately, the carbon in soil has been widely lost or degraded through land use changes and unsustainable forest and agricultural practices, fires, nitrogen deposition and other human activities. The greatest near-term threat comes from thawing permafrost in Earth’s northern reaches, which could release massive amounts of carbon into the atmosphere.
Despite these risks, there is also great promise, according to Jackson and Jennifer Harden, a visiting scholar in Stanford’s School of Earth, Energy & Environmental Sciences and lead author of the Global Change Biology paper.