Earth would be uninhabitable for humans if this was not the case. However, there is growing concern that certain human activities may be intensifying this greenhouse effect. While some scientists feel that the temperature increase observed in the past century is normal, IPCC has recommended that steps be taken to ensure that the rate of global climate change be limited to that which would allow ecosystems to adapt naturally. Therefore, there is interest in improving the efficiency of all fossil fuel systems and also in relying on those fuels with the lowest projected global warming effects.
Natural gas is such a fuel.
It emits about 30 percent less than coal on an equal energy basis. When the lower carbon content of natural gas is combined with high-efficiency applications, the benefits are magnified. Some natural gas cooling equipment can eliminate the environmental risks associated with ozone-depleting CFC refrigerants. Natural gas powered absorption chillers use water as the refrigerant, and gas desiccant dehumidification system do not use any refrigerants.