A group of scientists, philosophers and legal scholars are looking into radical geoengineering plans to artificially cool the Earth in a bid to reverse global warning. A U.N. climate conference in South Africa on Friday said that - in theory - reflecting a small amount of sunlight back into space before it strikes the Earth's surface would have an immediate and dramatic effect. Within a few years, global temperatures could return to levels of 250 years ago, before the industrial revolution began dumping carbon dioxide into the air, trapping heat and causing temperatures to rise
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