Purposefully sinking boreal trees could help lock away carbon for millennia or longer, but the audacious plan comes with risks of its own.

By precise numbers, it has reduced the average carbon content in the desert air from 416 parts per million to 413 ppm.

The Arctic is shifting from a frozen vault of ancient carbon to an active source of greenhouse gases, and that flip threatens to accelerate global warming for generations. Against that backdrop, ...

While its true that trees pull carbon from the atmosphere and store it within their woody biomass, the afforestation of the boreal forests—along with increased frequency of wildfires—is releasing that ...