Geoengineering aims to slow global warming by manipulating climate, but risks are unknown

Geoengineering can be as simple as planting trees to remove CO2 from the air or as complex as trying to use giant mirrors to reflect the sun into space. Some scientists say it has promise but warn that its potential pitfalls need more study by policymakers and experts alike.

Read more: http://www.cbc.ca/news/technology/geoeng...

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