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IF FORESTS are not sucking up enough carbon dioxide to halt global warming,
why not make an artificial “superforest” instead? A team of US government
researchers estimate that a superforest which covers 200,000 square
kilometres—roughly the size of Minnesota—would absorb CO₂
as fast as humanity is now churning it out.

Most strategies to curb global warming focus on producing less CO₂.
But Hans Ziock of Los Alamos National Laboratory in New Mexico argues that we
need to concentrate more on removing CO₂ with “scrubbers”.

Carbon dioxide scrubbers were first suggested as a way…