The White House has set into motion a five-year outline for research into "climate interventions". Those include methods such as sending a phalanx of planes to spray reflective particles into the upper reaches of the atmosphere, in order to block incoming sunlight from adding to rising temperatures. Previous attempts at running experiments for what is known as solar radiation management (SRM) have faced staunch opposition. Last year, an exploratory flight in Sweden of a high-altitude SRM balloon, led by Harvard University researchers, was halted after objections by environmentalists and Indigenous leaders. This prospect horrifies opponents of solar geoengineering. An open letter signed by more than 380 scientists demands a global non-use agreement for SRM; it also says that growing calls for research in this area are a "cause for alarm", due to an unknown set of ramifications that will have varying consequences in different parts of the world and could scramble "weather patterns, agriculture and the provision of basic needs of food and water". Frank Biermann, an expert in global governance ... said he's also disturbed that solar geoengineering will create a sort of moral hazard where governments ease off efforts to cut emissions and fossil fuel companies use it as cover to continue business as usual. There isn't any international governance around solar geoengineering. Unilateral action to alter the climate could spark conflict if one part of the world benefits, while another suffers.