Biochar, the new type of fertilizer that almost completely removes greenhouse gas emissions has officially received a grant to be incorporated into seven major cities. Biochar is created by putting grass trimmings, hedge clippings, tree branches, or any other kind of yard waste, into an enclosed space and “pyrolyzing it” in such a way as to avoid the rapid oxidation of CO2. As one benefit, the process is carbon negative, meaning it removes more CO2 than it produces.

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