On a site next to a sawmill in Waverly, Virginia, a startup takes sawdust and offcuts from the mill and heats it up to turn it into biochar, a material that can store carbon for hundreds or thousands ...

Biochar might sound like some kind of trendy new superfood, but it’s actually a powerful climate solution made from a very old idea. At its core, biochar is a type of charcoal made by heating organic ...