MYTH: The existence of global warming is still in debate.
FACT: In 2005, the U.S. National Academy of Sciences issued a joint statement with 10 other National Academies of science saying the understanding of climate change is clear enough to justify nations taking prompt action to take the necessary steps to contribute to the long-term reduction of net greenhouse gas emissions. The only debate about the existence of global warming is how much and how fast it will affect us (Environmental Defense).

MYTH: Extinction is natural, so there isnt any problem with letting nature take its course.
FACT: It is correct to assume the extinction of species has been happening since the beginning of life, and that it is indeed a natural occurrence. The problem is that species are disappearing at an accelerating rate estimated at 100 to 10,000 times Earths historical average (The Nature Conservancy).

MYTH: You should leave your car on if you are going to be turning it back on in a few minutes because it uses less fuel than turning the engine back on.
FACT: Idling for more than ten seconds uses more fuel than restarting your engine even in cold weather. It is also harder on the engine (Mount Holyoke).

MYTH: The Endangered Species Act does not work, and species are not recovering despite all of the money being spent.
FACT: The results of the Endangered Species Act are noticeable all over the country. More bald eagles, black-footed ferrets, American alligators, and whooping cranes are in the United States today than at any time in the past quarter-century. Though numerous other species have yet to be completely recovered, their path towards extinction has been halted, and their populations stabilized (Environmental Defense).

MYTH: Climate change isnt a big deal civilization has survived droughts and temperature shifts before.
FACT: While it is true climate change has happened in the past, we now live in a world with over six billion people who depend on an intricate interconnected ecosystem and a complex technological infrastructure. Should one aspect of that falter, it will affect the rest of the population. Even if people find a way to adapt to rapid climate change, the wildlife and plants on which we depend may have difficulty adjusting (Environmental Defense).

MYTH: Leaving the lights on when you leave a room uses less energy then having to turn them back on.
FACT: While fluorescent lights do take a surge of power to turn on, it is more energy efficient to turn them off if leaving the room for more than a minute (Mount Holyoke).

MYTH: Global warming will not be a problem when the hole in the ozone layer shrinks.
FACT: Global warming and the ozone hole are two different problems. The thinning of the ozone layer (mainly due to the emission of man-made chemicals like chlorofluorocarbons) has led to an increase in ultraviolet radiation reaching the earths surface. Global warming, on the other hand, is an increase in the earths average temperature caused by an atmospheric buildup of CO2 and other greenhouse gases (Environmental Defense).

MYTH: Recycling is not as cost-effective as landfills.
FACT: When designed well, recycling is just as cost-competitive as landfills, and provides us with pollution prevention benefits. Recycling materials not only avoids extra waste though reuse, but reduces the environmental burden of extracting new resources from the earth (GRN).

MYTH: Since heating up a room takes so much energy, it is better to keep the thermostat set at the same temperature all the time.
FACT: : It takes less energy to warm up a cold home in the morning than it does to maintain a constant temperature throughout the day. Turning the thermostat down at night or when no one is home will save energy (Mount Holyoke).

MYTH: Recycling does not save trees since we are planting trees specifically to make paper.
FACT: : While more trees are being planted than cut, tree plantations are quickly replacing natural forests. These plantations act as an excellent source for wood, but fail to provide natural animal habitats or preserve biodiversity (Environmental Defense).

Resources:
http://www.environmentaldefense.org/article.cfm?contentid=1158
http://www.nature.org/magazine/winter2003/resources/
http://www.environmentaldefense.org/page.cfm?tagID=1011
http://www.environmentaldefense.org/documents/611_ACF17F.htm#myth8
http://www.grn.com/library/5myths.htm
http://www.mtholyoke.edu/org/ccc/website/campaigns_energyfacts.html