Energy is defined by the Merriam Webster dictionary as "fundamental entity of nature that is transferred between parts of a system in the production of physical change within the system and usually regarded as the capacity for doing work".Merriam-Webster: Energy

• Kenetic Energy
• Potential Energy
• Thermal Energy
• Gravitational Energy
• Sound Energy
• Light Energy
• Chemical Energy
• Nuclear Energy

On July 17, 2008, former vice president Al Gore made a speech in Washington, D.C. challenging Americans to stop relying on fossil fuels within ten years.UK Telegraph: Al Gore Calls For All US Energy... (July 18, 2008) The speech came on the heels of President George W. Bush rescinding the ban on Arctic drilling.Associated Press: Gore Sets Energy Goal For Next President To Heed (July 18, 2008)