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Geoengineering – our last hope in fighting global warming?

Most scientists believe global warming poses a threat to our lives here on Earth. But how can we fix it? There is talk of alternative fuels: wind, solar, tidal, and geothermal power, as well as recycling, cutting emissions, etc. But so far, some say, little has been accomplished. So what if humans could alter the climate by changing Earth itself? Some countries and entrepreneurs are conducting geoengineering research to see if this approach is feasible and safe. Many environmentalists shudder at the idea – political, ethical, and social consequences of such action could be huge and very negative. So if humans refuse or are unable to change, is it possible to mess with Mother Nature and make her change for us?