Learn To Subtract - A QuickTime Movie
Why economists refer to their trade as The Dismal Science.

Republican Energy Policy - Texas Corporate Welfare
It seems some republicans are thinking like drug dealers, wanting to profit from America’s energy addiction and not caring about the long term consequences.

Test your Earth Day IQ
As the symbolic birth of the environmental movement, Earth Day will be celebrated by millions of participants around the world. How much do you know about Earth?

Global Warming I.Q. Test
"Global warming" and the "greenhouse effect" have been buzzwords for years now. But how much do you know about these environmental celebrities?

Test your environmental knowledge
Studies show that many American adults are failing the environmental IQ test ó and that many are drowning in environmental myths. How do you measure up?

Environmental History Quiz
Volumes have been written about the environment, and volumes more will be written in the future. How much do you know about the environment you live in?

Home energy and water quiz
North Americans on average use a staggering 1,300 gallons of water per person every day. At the same time, nearly half the world's population doesn't have enough water for adequate sanitation. How much do you know about reducing water and energy consumption in the home?

ENN's Green Car quiz
How much do you know about minimizing your car's impact on the environment?

Native Plants quiz
You may have planted California poppies near your Los Angeles patio or black-eyed Susans in your Cincinnati perennial border. But how much do you really know about gardening with native plants?

Socially Responsible Investing quiz
You recycle every day, carpool to work and do everything you can to tread lightly on the planet. But you still want a good return on your investments and would like to have money set aside for retirement, your kidís college tuition and maybe a vacation in the Bahamas. How can green habits grow your investment portfolio?

Birds of Prey quiz
From the graceful eagle to the carrion-eating turkey vulture to the dive-bombing peregrine falcon, birds of prey are among the most spectacular animals on Earth. What do you know about birds of prey? Can you name the largest in North America? Is the bald eagle an endangered species? There's a lot to know about this extraordinary group of birds.

Winter Energy Conservation quiz
The U.S. Department of Energy predicts higher heating bills for Americans this winter. This is hardly good news, but it could also serve as a wake-up call to steer home builders and homeowners toward energy efficiency. Find out what you know and don't know about preparing your home for winter.

Recycling quiz
Although Americans generate about 210 million tons of trash each year, they keep about 30 percent of the garbage out of landfills and incinerators through recycling. Considered "one of the best environmental success stories of the late 20th century" by the Environmental Protection Agency, recycling saves space in landfills and reduces costs, energy and natural resource consumption, and pollution. What do you know about recycling?

Wolf quiz
Few animals in the wild stir human emotions, positive and negative, in quite the same way as the wolf. Shrewd predators, doting parents and playful pranksters, these majestic animals symbolize the true wildness of nature to many people. But to others, wolves represent a threat to human livelihood.

Healthy Eating quiz
Proper nutrition is a mainstay of a healthy lifestyle. Paying attention to what you put in your mouth will not only keep you from gaining weight, good eating habits can also reduce the risk of many chronic diseases, including cancer, diabetes, stroke, osteoporosis and heart disease. But what are "good" eating habits?

Hydropower quiz
The power of water has been used over the last two millennia to help grind grain, irrigate fields, drive sawmills, and, in the last century or so, generate electricity. While electricity created through hydropower is cheap, clean and renewable, blocking entire rivers for the sake of electricity has its environmental costs.

National Parks quiz
From A to Z, Arches to Zion, America's national parks range from vast to small, from focal points of history to sites of extraordinary natural beauty. How much do you know about U.S. national parks?

Basic genetics quiz
One of the greatest areas of scientific discovery in recent years may not be in outerspace or the deep sea, but lies instead within the uncharted terrain of the human body. How much do you know about the very material that determines who you are?

GM food quiz
Genetically modified food accounts for a significant portion of all food produced in the United States and may well constitute a portion of your daily diet. How much do you know about GM food?

Salmon quiz
Of all aquatic animals, few have stirred as much debate as the salmon. Like the wolf and grizzly bear, salmon are a symbol of nature in its original, wild state. How much do you know about this extraordinary fish?

Sun safety quiz
Outdoor activities add tremendously to health, fitness and general well-being. But beware: Exposure to the sun can damage the body in many ways. How much do you know about sun safety?

Atmospheric science quiz
The nature and condition of Earth's atmosphere is the source of intense research and debate. What do you know about the cloak that envelops and protects our planet?

Ecology terminology quiz
Every discipline of study has a unique vocabulary. The world of ecology is no different from the rest. With words that convey how organisms relate to each other and the environment, the language of ecology is colorful and dynamic. How well do you understand ecology terminology?

Astronomy quiz
Think you know what makes stars burn and worlds turn?

The river quiz
Streamside, or riparin, habitat occupies a very small percentage of the total land mass in most areas of the world, yet within riparian areas is an abundance of beauty and a tremendous variety of plant and animal species. How much do you know about riparian areas?

Whale Quiz
Perhaps the most awe inspiring residents of the natural world are the great whales that ply the deep ocean waters. Immortalized in both word and song, whales have been a source of inspiration for many. Few animals have also been the subject of such controversy as conservation organizations fight to protect the whales. What is your whale IQ?

Fitness quiz
Regardless of the season, there is always an endless stream of options available to those who wish to spend time in the great outdoors. Whether you enjoy hiking, biking, skiing or running, you will have a more memorable experience if you are physically fit. Do you know the benefits of physical fitness?

Alternative Transportation Quiz
One of the most important daily decisions we make that affects the environment is our choice of transportation. Riding a bicycle instead of driving a fuel-thirsty SUV can mean the difference of hundreds of pounds of carbon dioxide and other pollutants fouling the air.

Alternative energy quiz
Alternative energy sources are being refined in the laboratory and tested in the field as solutions to harmful, nonrenewable fossil fuels. How much do you know about alternative fuel sources?

Snake Quiz
Snakes are among the most misunderstood and maligned members of the animal world. Unfounded stories have only added to the misunderstanding and occasional hysteria that surround these fascinating reptiles. How much do you know about snakes?

Herbal remedy quiz
Herbal remedies are gaining popularity in the United States. Already common in Europe, Asia and many other parts of the world, herbal solutions to ailments are finding favor in the states as their benefits are better understood. How much do you know about these remedies?

Wetlands quiz
Wetlands may conjure images of mosquito-infested swamps or sloughs that are little more than an irritation. But wetlands constitute some of the most productive habitat on Earth and are home to myriad species of wildlife. How much do you know about wetlands and their importance to the environment?

Take the ENN tree quiz
Trees are nearly everywhere around us. But how much do we know about them?

Severe-weather quiz
By its purest definition, weather is nothing more than the general atmospheric conditions prevalent at any one place and time. These conditions include temperature, moisture, wind and other related phenomena. But weather is not quite as simple as the definition implies. What do you know about the weather around you?

Food Chain Quiz
You are what you eat! How many times have you heard this? But where in fact do you fit in the food chain? How much do you know about the web of life?

Endangered species quiz
The web of life is made up of millions of unique species, each with its own system of adaptation for survival. The world's endangered species are an essential but fragile part of that web.

Fire ecology quiz
When we hear the word "fire!" we tend to think only of the destructive forces of nature at work. Yet nature is much more ambivalent about fire than we are and may even require fire for its very survival.What do you know about the role of fire in shaping the landscape around you?

Low impact camping: take the quiz
When you camp and hike this summer, will you bring along the knowledge required to enjoy the outdoors while causing minimal harm to the environment?

Biome quiz
The world's ecosystems are the sum of many parts, including natural plant communities called biomes. How much do you know about the biomes that make up the world around you?

Population Quiz
The issue of world population has many points of view and few certainties. But one aspect of the argument is clear: Knowledge is the key to solving population problems. How much do you know about world population?

A horse is a horse, of course, of course
How much do you know about the species that share the world with us?

Tippecanoe to Timbuktu: the ENN geography quiz
As recently as 1994, only 27 percent of American high school seniors scored "proficient" on a test of general geography, according to the National Assessment of Educational Progress. How do you rate?

Space: The Final Frontier
Interested in learning more about the vast universe through which we float each day? Ever wonder what lies beyond our home, our city, our country, our Earth?

Ocean I.Q. Test
Oceans have played a crucial role in exploration, combat and sustenance. How much do you know about nature's tides, marine ecosystems, and basic ocean facts?

Water Quiz
At least 70 percent of the Earth's surface is covered by water. But how much of it is potable?