The Intergovernmental Panel on Climate Change (IPCC) latest report focuses on relatively low cost strategies to reduce the emissions of global warming gases -- at least when compared to cost of inaction.
Among the suggested reduction strategies:
Wider use can be made of passive solar design; high-efficiency lighting and appliances, ventilation and cooling systems; solar water heaters; modern insulation and techniques; high-reflectivity building materials; and multiple glazing. Governments can contribute by continuously updating their building codes and appliance standards.
Emerging technology like directed-injection turbocharged diesel engines, improved vehicle batteries, regenerative breaking, high-efficiency propulsion systems for trains, and blended wing bodies and unducted turbofan propulsion systems for airplanes could increase efficiency. Biofuels also have the potential to replace a substantial part of the petroleum now used in transportation.
Farming methods can be altered to "sequester" more carbon in the soil rather than release it into the atmosphere, for example by restoring organic soils that are drained for crop production. Smaller but still significant reductions are possible with other changes, including improved water and rice management; wider adoption of agroforestry; and improved livestock and manure management."