The clock is ticking as nature attempts to absorb the increased greenhouse gas emissions.

We have to understand the ubiquity of energy in everything we do. Energy is core to our economy and it brings with it environmental challenges, and it's core to our security challenges.

A 1.5 litres/100km (3 mpg) increase in the auto and light truck fleet is worth 158,968.35 cubic metres (41,994,994.53 US gallons) of oil a day.

Electricity generation emits more carbon dioxide in the United States than does transportation or industry, and nuclear power is the largest source of carbon-free electricity in the country.

The clock is ticking as nature attempts to absorb the increased greenhouse gas emissions.