Independent: Fears that the world is not doing enough to cut carbon dioxide emissions are forcing scientists to “think the unthinkable” by taking seriously the idea that humans may have to alter the global climate artificially with mega-engineering projects. The Royal Society will launch a study later this year aimed at reviewing the possibility of saving the planet by “geoengineering” the climate on the grandest scales imaginable. Geoengineering encompasses schemes such as fertilising the …