Co2 To Ploughshares

For indispensable reporting on the coronavirus crisis, the election, and more, subscribe to the Mother Jones Daily newsletter.


800px-Farmer_plowing.jpg An ancient method of ploughing charred plants into the ground to revive soil may also trap greenhouse gases for thousands of years. Here’s how it works: Plants absorb CO2 from the atmosphere as they grow. Burning these plants and trees in airtight conditions produces a high-carbon substance called biochar. Johannes Lehmann of Cornell estimates the carbon storage time of stable biochar could be a few thousand years, reports Reuters.

Lehmann’s ambitious scenario estimates biochar could store 1 billion tons of carbon annually. That’s more than 10 percent of 2007’s 8.5 billion tons of global carbon emissions. His conservative scenario prescribes heating without oxygen (pyrolysis) 27 percent of the world’s crop waste and ploughing it into the soil to store 0.2 billion tons of carbon a year.

According to the International Biochar Initiative, soils with biochar made by Amazon people thousands of years ago still contain up to 70 times more black carbon than surrounding soils and are still higher in nutrients. . . Two big howevers: We can’t cut forests to do this and we can’t avoid reducing CO2 emissions at the same time. But we can put all the little fixes together starting now.

Julia Whitty is Mother Jones’ environmental correspondent, lecturer, and 2008 winner of the PEN USA Literary Award, the Kiriyama Prize and the John Burroughs Medal.

DEMOCRACY DOES NOT EXIST...

without free and fair elections, a vigorous free press, and engaged citizens to reclaim power from those who abuse it.

In this election year unlike any other—against a backdrop of a pandemic, an economic crisis, racial reckoning, and so much daily crazy—Mother Jones' journalism is driven by one simple question: Will America move closer to, or further from, justice and equity in the years to come?

If you're able to, please join us in this mission with a donation today. Our reporting right now is focused on voting rights and election security, corruption, disinformation, racial and gender equity, and the climate crisis. We can’t do it without the support of readers like you, and we need to give it everything we've got between now and November. Thank you.

DEMOCRACY DOES NOT EXIST...

without free and fair elections, a vigorous free press, and engaged citizens to reclaim power from those who abuse it.

In this election year unlike any other—against a backdrop of a pandemic, an economic crisis, racial reckoning, and so much daily crazy—Mother Jones' journalism is driven by one simple question: Will America move closer to, or further from, justice and equity in the years to come?

If you're able to, please join us in this mission with a donation today. Our reporting right now is focused on voting rights and election security, corruption, disinformation, racial and gender equity, and the climate crisis. We can’t do it without the support of readers like you, and we need to give it everything we've got between now and November. Thank you.

We Recommend

Latest

Sign up for our free newsletter

Subscribe to the Mother Jones Daily to have our top stories delivered directly to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate