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            Earth & Environment

            Environment covers air pollutants, global warming, the greenhouse effect, and other dangers to the planet. It also includes a glossary of environmental terms as well as a brief directory of environmental organizations. Energy details world and U.S. energy consumption, renewable energy, the world's largest oil and gas reserves, and nuclear power. Nature discusses the Earth's wide variety of animals and plants and its endangered species.

            An Extraordinary Approach

            Fuel Cell FAQs

            The Greenhouse Gas Effect

            Global Warming

            The National Park System

            Electric Cars Powered By Gasoline?

            Rethinking Old Technology

            Energy Websites

            Major Biomes of the World

            Coniferous Forest

            Deciduous Forest

            Desert

            Grasslands

            Mountains

            Rainforests

            Arctic Tundra

            Fukushima Daiichi Nuclear Power Station

            User's Guide to Environmental Language

            Environmental Organizations

            Oil in the Caspian Region

            All About Ozone

            I. The Ozone Layer

            II. Ozone Depletion

            III. Ozone FAQ

            State of the Worlda€?s Forests

            U.S. Energy Sources, 2006a€“2012

            The 2005 Environmental Sustainability Index (ESI)

            America's Troubled Waters

            Safe Drinking Water Reports and Hotline

            Top Ten Most Polluted Places in the World, 2007

            Forced Conservation

            Greatest Oil Reserves by Country, 2007

            America's 25 Most Ozone-Polluted Metropolitan Areas, 2007

            America's 25 Most Ozone-Polluted Metropolitan Areas, 2008

            America's 25 Most Ozone-Polluted Metropolitan Areas, 2009

            America's 25 Most Ozone-Polluted Metropolitan Areas, 2010

            America's 25 Most Ozone-Polluted Metropolitan Areas, 2011

            America's 25 Most Ozone-Polluted Metropolitan Areas, 2012

            Why Build Green?

            Do Cell Phones Cause Cancer?

            Cleanest U.S. Cities for Ozone Air Pollution 2007

            Earth Day: History, Stats & Facts, Recycling Tips & More

            Earth Day

            Global Food Crisis

            A Warming Ocean

            Green Weddings

            Top Ten Green Hotels in the United States, 2007

            Top Ten Green Hotels in the United States, 2010

            Top Ten Green Hotels in the United States, 2012

            Top Ten Green Hotels in the United States, 2013

            Top Ten Green Hotels in the United States, 2014

            Living Off the Grid

            The Top 10 Lowest Radiation Cell Phones, 2012

            The Top 10 Lowest Radiation Cell Phones, 2013

            Top Ten Greenest Colleges in the U.S., 2011

            Top Ten Greenest Colleges in the U.S., 2012

            Top Ten Greenest Colleges in the U.S., 2013

            Top Ten Toxic Industries

            Top Ten Most Polluted Places in the World, 2012

            The World's Worst Pollution Problems, 2008

            The World's Worst Pollution Problems, 2011

            The World's Worst Pollution Problems, 2012

            The Year of the Potato

            Earth Day: History, Stats & Facts, Recycling Tips & More

            Top Carbon Dioxide Emitters

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            Marine Debris in the United States

            America's 25 Most Ozone-Polluted Cities, 2007

            Water Supply of the World

            Renewable Energy Consumption in the U.S. by Source, 1989-2010

            Estimated Number of Alternative-Fueled Vehicles in the U.S., 1992-2005

            Major Air Pollutants

            Motor Vehicle Fuel Consumption and Travel in the U.S., 1960-2006

            Ten Most Visited National Parks

            National Historical Parks

            National Monuments

            National Preserves

            National Reserves

            National Military Parks

            National Battlefields

            National Battlefield Parks

            National Battlefield Site

            National Historic Sites

            National Memorials

            National Cemeteries1

            National Seashores

            Parkways

            National Lakeshores

            National Park System Rivers

            Other Parks

            National Recreation Areas

            National Scenic Trails1

            International Historic Site

            Largest Nuclear Power Plants in the U.S.

            National Forest System, 1900-2004

            World Energy Consumption and Carbon Dioxide Emissions, 1990a€“2025

            America's Ten Most Endangered Rivers, 2006

            Historical and Projected Capacities for Nuclear Electricity Generation, 1996a€“2020

            World Net Electricity Consumption by Selected Regions, 1990a€“2025

            U.S. Emissions of Greenhouse Gases, 2001a€“2006

            Air Quality in Selected U.S. Cities, 1990a€“2000

            Greatest Oil Reserves by Country, 2006

            Greatest Natural Gas Reserves by Country, 2006

            NATIONAL PARKS

            Most and Least Fuel Efficient Vehicles, 2008

            America's 25 Most Ozone-Polluted Metropolitan Areas, 2006

            Top Energy Producers and Consumers, 2006

            Top World Oil Producers, Exporters, Consumers, and Importers, 2006

            International Park

            National Historic Area

            National Heritage Areas

            National Heritage Corridors

            National Historic Trails1

            Top Ten Types of Debris Littering the Oceans

            2008 Environmental Performance Index

            The Toxic 100: Top Corporate Air Polluters in the United States

            The Top Carbon Dioxide Emitters

            Drinking Water and Sanitation Around the World

            Top Energy Producers and Consumers, 2008

            Retail Motor Gasoline Prices in Selected Countries, 2006

            Retail Motor Gasoline Prices in Selected Countries, 2015

            Greatest Oil Reserves by Country

            Top Energy Producers and Consumers, 2008

            Top Oil Producers and Consumers, 2010

            Top Oil Producers and Consumers, 2011

            Top Oil Producers and Consumers, 2012

            Top Oil Producers and Consumers, 2013

            U.S. Energy Consumption by Energy Source, 2002a€“2012

            Sources of U.S. Oil Imports

            World Carbon Dioxide Emissions From Energy Consumption, 2004

            World Primary Energy Consumption by Region, 1995a€“2004

            World Primary Energy Production by Region, 1995a€“2004

            World Primary Energy Production by Source, 1970a€“2007

            America's Ten Most Endangered Rivers, 2007

            America's Ten Most Endangered Rivers, 2008

            America's Ten Most Endangered Rivers, 2010

            America's Ten Most Endangered Rivers, 2011

            America's Ten Most Endangered Rivers, 2012

            America's Ten Most Endangered Rivers, 2013

            America's 25 Most Ozone-Polluted Metropolitan Areas, 2013

            America's 25 Most Ozone-Polluted Metropolitan Areas

            2014 Environmental Performance Index

            Most and Least Fuel Efficient Vehicles, 2005

            America's Top Ten Greenest Buildings

            Ten Most Visited National Parks, 2012

            Ten Most Visited National Parks, 2013

            Ten Most Visited National Parks, 2015

            The Pilot 2006 Environmental Performance Index

            Thirstiest Crops

            The Toxic 100: Top Corporate Air Polluters in the United States, 2010

            The Toxic 100: Top Corporate Air Polluters in the United States, 2012

            Top Ten Types of Debris Littering the Oceans, 2012

            Top Ten Types of Debris Littering the Oceans, 2013

            Top Ten Types of Debris Littering the Oceans, 2014

            Top Ten Greenest Colleges in the U.S., 2008

            Top Ten Greenest Colleges in the U.S., 2009

            Top Ten Greenest Colleges in the U.S., 2010

            U.S. Emissions of Greenhouse Gases, 1990a€“2000

            Top Ten Most Polluted Places in the World, 2013

            Ten Most Visited National Parks, 2014

            Top Ten Dog Breeds

            Oil Reliance

            Table of Geological Periods

            Ten Most Visited National Parks, 2006

            Ten Most Visited National Parks, 2009

            Ten Most Visited National Parks, 2010

            Ten Most Visited National Parks, 2011

            Environment

            Energy

            Nature

            Periodic Table

            Slideshow: Non-Native Species Invade the United States

            Non-Native Species: Land Animals

            Non-Native Species: Aquatic Animals

            The Top Ten: Least Polluting Cars, 2006

            The Top Ten: Least Polluting Cars, 2007

            The Top Ten: Most Polluting Cars, 2006

            The Top Ten: Most Polluting Cars, 2007

            The Top Ten: Top Oil Consumers

            What the Frack

            No Tripping the Light Fantastic over This Debate

            Recycling Facts

            Climate Change Imperils Future of Several Nations

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