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A climate expert says spraying sea salt into the troposphere is less threatening than other current efforts, but the lack of robust regulations is concerning.
A U.S. company is already sending balloons filled with sulfur dioxide into the stratosphere. NASA is considering flying ice into the atmosphere.
One proposed way of dealing with climate change includes fertilising the oceans with iron.
Atlantropa was the brainchild of the German architect Herman Sörgel, who tirelessly promoted his project from 1928 until his death in 1952.
