ClimateWire: Responding to renewed interest in geoengineering schemes to combat global warming, scientists and policymakers are beginning several efforts that could set new ground rules for research, including large-scale field experiments. Last week, a committee in Britain’s House of Commons began an inquiry to determine whether developing and deploying geoengineering methods will require new British or international regulations. The U.K. panel is cooperating with an American counterpart, the …