Iceland facility leads efforts to pull carbon from air and explore risky climate manipulation technologies

• Machine in Iceland will pull carbon dioxide out of the air to fight climate change

• Technologies that re-engineer the environment were once seen as sci-fi but are now mainstream

• Series examines risky ways humans are manipulating nature to address climate change

• Researchers studying blocking sun's radiation, adding iron to oceans, building space parasols

• Iceland facility aims to reduce carbon dioxide concentration in the air