We have to slow down the emissions of carbon dioxide and methane from coal burning, oil and eventually natural gas... And the best ways to do that are energy efficiency and a switch to renewables.

The total amount of energy we use every year - from coal, oil, natural gas, hydro, nuclear, and everything else - is dwarfed by the amount of solar energy hitting the planet each year.

In spite of all the natural energy which keeps our universe in activity, man still resorts to the most primitive of methods; digging up things and burning them.

Electricity is derived from many non-renewable energy sources like oil, natural gas and coal.

Natural gas emits only half the carbon dioxide of coal when burned, but if methane leaks when oil companies extract it from the ground in a sloppy manner - methane is far more potent a greenhouse gas than carbon dioxide - it can wipe out all the advantages of natural gas over coal.

New York and Connecticut belong to the Regional Greenhouse Gas Initiative to cut carbon emissions, and New York City has been a leader in energy efficiency.