Venture capitalists, startup founders and tech executives are funding studies, experiments and small deployments of controversial technology that could cool the planet.
Delhi's Environment Minister Gopal Rai held a meeting with IIT Kanpur scientists to discuss the possibility of artificial rainfall by using cloud seeding in order to curb air pollution in the city.
The White House is coordinating a five-year research plan to study ways of modifying the amount of sunlight that reaches the earth to temper the effects of global warming, a process sometimes called solar geoengineering or sunlight reflection.
A fleet of 125 military air-to-air refuelling tankers would release a cloud of microscopic sulphur dioxide particles at an altitude of 43,000ft (13km) and a latitude of 60 degrees in both hemispheres, slightly shading the Earth's surface beneath.
One of the great hopes is something called solar geoengineering, notes Clara Ferreira Marques, which is essentially an attempt to figure out a way to cool the planet by deflecting some of the sun’s rays before they reach us humans.
