RedOrbit: Artificial clouds that reflect sunlight back into space. A StratoShield that spews sulfur dioxide particles into space like a volcano, cooling the planets surface. Microbial blooms that grow on iron injected into the ocean and trap carbon dioxide from the atmosphere. These are some of the latest ideas being tested to combat climate change in an emerging and hotly-debated field called geoengineering.
Geoengineering involves use of technologies that deliberately manipulate the Earths climate,...