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Geo-engineering, large-scale modification of the global climate system is no longer science fiction, under the pressure of global warming. By catching the CO2 present in the atmosphere thanks to artificial tree forests, by reflecting sunlight in making a shield in the stratosphere, scientists are testing new technologies, which should limit global warming effect, and not to say, cool down the whole planet. What is the process? How does it work? It is really feasible already? How can the solutions be tested? What are the risks for the planet?