However, when used for domestic heating of water, the greenhouse gas footprint of natural gas is at least two - times larger than that of using modern electric - driven heat pumps. (dotearth.blogs.nytimes.com)
However our future scenarios project that these emissions will decline, as cleaner methods of domestic heating and cooking are developed. (giss.nasa.gov)
Sources of black carbon include burning of wood and other biofuels, for domestic heating and cooking and in forest and field burning, and combustion of fossil fuels, especially coal and diesel. (giss.nasa.gov)