Placing vast amounts of solar and wind farms in the Sahara Desert in Africa would do more than just generate clean energy. According to a major new study, installing large-scale wind and solar farms in the Sahara could cause more local rainfall. Such rainfall could then lead to an increase of vegetation, which would further increase rainfall. For a detailed look into the dually-positive effects that could come about from generating renewable energy in the Sahara, take a look here.