Recycled Biofuel

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57031182_68ca6da51a.jpg A better way to grow biofuel crops is to re-use abandoned agricultural lands. Or farmlands that are less productive. Both are better than current practises: clearing wilderness and converting food farms to energy farms.

There are 1.5 million square miles of abandoned cropland and pastureland available around the world. Energy crops raised on these could yield up to 27 exajoules of energy a year—equal to 172 million barrels of oil. Yet even this would still satisfy only about 5% of global primary energy consumption—483 exajoules in 2005, and rising.

Better than nothing, you say. But only if it doesn’t further aggravate climate change. The study by Carnegie Institution and Stanford University scientists used historical data, satellite imagery, and productivity models to estimate how to maximize the benefits from biofuels while also mitigating global warming. Recycling old farms yields the best atmospheric returns.

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

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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 will 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.

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