A crop farmer plants corn for the first time of the season, in 2011. (Melina Mara/The Washington Post) June 12 Last month, carbon dioxide levels in the atmosphere surpassed 415 parts per million , the highest in human history. Environmental experts say the world is increasingly on a path toward a climate crisis. The most prominent efforts to prevent that crisis involve reducing carbon emissions. But another idea is also starting to gain traction — sucking all that carbon out of the atmosphere and storing it underground. It sounds like an idea plucked from science fiction, but the reality is that trees and plants already do it, breathing carbon dioxide and then depositing it via roots and decay into the soil. That’s why consumers and companies often “offset” their carbon emissions by planting carbon-sucking trees elsewhere in the world. But an upstart company, Boston-based Indigo AG, now wants to transform farming practices so that agriculture becomes quite the opposite of what it is today — a major source of greenhouse gas emissions. By promoting techniques that increase the potential of agricultural land to suck in carbon, the backers of Indigo AG believe they can set the foundation for a […]

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