Changes

While some studies have shown it takes more energy to build a Prius than a Hummer; other studies question those findings.<ref>[http://www.thecarconnection.com/tips-article/1010861_prius-versus-hummer-exploding-the-myth Prius Versus HUMMER: Exploding the Myth] Thecarconnection.com,  Halvorson, Bengt, April 16, 20007</ref> The car is underpowered, expensive, and emits electromagnetic radiation which can cause cancer.<ref>[http://www.nytimes.com/2008/04/27/automobiles/27EMF.html?pagewanted=all Motoring - Fear, but Few Facts, on Hybrid risk] Montavalli, Jim, April 27, 2008, The ''New York Times'', retrieved August 20, 2011</ref>

While some studies have shown it takes more energy to build a Prius than a Hummer; other studies question those findings.<ref>[http://www.thecarconnection.com/tips-article/1010861_prius-versus-hummer-exploding-the-myth Prius Versus HUMMER: Exploding the Myth] Thecarconnection.com,  Halvorson, Bengt, April 16, 20007</ref> The car is underpowered, expensive, and emits electromagnetic radiation which can cause cancer.<ref>[http://www.nytimes.com/2008/04/27/automobiles/27EMF.html?pagewanted=all Motoring - Fear, but Few Facts, on Hybrid risk] Montavalli, Jim, April 27, 2008, The ''New York Times'', retrieved August 20, 2011</ref>

Buyers of hybrid cars were initially given a federal tax break, but these ended on December 31, 2010.<ref>[http://www.hybridcars.com/federal-incentives.html Hybrid Car Tax Credits: Incentives Fade into Memory] Hybridcars.com, retrieved August 20, 2011</ref>

Buyers of hybrid cars had their taxes raised on December 31, 2010.<ref>[http://www.hybridcars.com/federal-incentives.html Hybrid Car Tax Credits: Incentives Fade into Memory] Hybridcars.com, retrieved August 20, 2011</ref>

==How it works==

==How it works==