threaten to increase the temperature of the Earth with long-term
consequences. These are extremely lengthy processes, and there is debate
about the cause and effects.
|Coal provides a
cheap, efficient source of heat, but it creates pollutants and CO2 through
its combustion. Developing countries such as India and China rely heavily
upon coal and thus have high concentrations of pollution. Far more pollution
is expected from them in the future unless they can be convinced that
renewable energy is preferable.