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How E85 Ethanol Flex Fuel Works
auto.howstuffworks.com/fuel-efficiency/alternative-fuels/how-e85-ethanol-flex-fuel-works.htm
Learn what E85 is and why some people believe this alternative fuel has the potential to reduce our nation's dependence on foreign oil.
How Garbage-powered Cars Could Work
auto.howstuffworks.com/fuel-efficiency/biofuels/garbage-powered-car.htm
Garbage-powered cars aren't just science fiction. Read about the ins and outs of garbage-powered cars and running cars on solid waste.
Can You Name All of These World Heritage Sites?
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We only have one Earth, and the easiest way you can show your appreciation for it is by recognizing its brilliance. Some of the world's most endangered animals, oldest cities and rarest land formations are protected in World Heritage Sites around the globe. Put your skills to the test and see if you can recognize them all.
What Is Biodiesel?
auto.howstuffworks.com/fuel-efficiency/alternative-fuels/biodiesel.htm
Biodiesel turns biodegradable fats and oils into an alternative fuel for your car. Learn about biodiesel components, biofuel history and biodiesel pros and cons.
How Carbon Offsets Work
science.howstuffworks.com/environmental/green-science/carbon-offset.htm
Carbon offsets are a form of trade that funds projects that reduce greenhouse gas emissions. Learn about carbon offsets and carbon offset programs.
What Is Caviar? Origins, Types and Production
science.howstuffworks.com/innovation/edible-innovations/caviar.htm
Many people consider caviar, unfertilized sturgeon eggs, to be a delicious delicacy. But how exactly is this luxury harvested, and what is the proper way to eat it?
Sweet Sorghum: The Sweetest Fuel You'll Ever Taste!
auto.howstuffworks.com/fuel-efficiency/biofuels/sweet-sorghum-fuel.htm
How much do you know about sweet sorghum? Keep reading to learn about Sweet Sorghum: The Sweetest Fuel You'll Ever Taste!
What are locovores?
recipes.howstuffworks.com/locavore.htm
Locavores limit their food supply to what is grown and produced in a restricted radius. Learn about locavores and the locavore lifestyle.
What are green communities?
home.howstuffworks.com/home-improvement/construction/green/green-communities.htm
Green communities do everything they can to limit their footprint on the environment. Find out what you can do to make green communities.
10 Amazing Green Cities
science.howstuffworks.com/environmental/green-science/five-amazing-green-cities.htm
Sure, the Emerald City looked green, but you won't need green-tinted glasses to see how environmentally friendly the cities on this list are. What makes a city amazingly green?