The controversy over the Clean Air Act is worth understanding because it reveals a pivotal development that EPA and the environmental groups would prefer to conceal: the 40-year-old act is no longer a sensible way to regulate large-volume conventional air pollutants such as ozone and particulate matter.

The Environmental Protection Agency’s reasons for not using its usual approach to regulating greenhouse gases unwittingly shows that it is obsolete for controlling conventional pollutants. Congress should update the Clean Air Act.

This volume covers seven major indicators of environmental progress, including air quality, energy, climate change, water quality, toxic chemicals, forests and land, and biodiversity.

Panelists will discuss the potential benefits and liabilities of the Clean Air Act.

Improvements seen across key environmental indicators should be cause for celebration this Earth Day, according to Steven F. Hayward, Ph.D., author of the new book "Almanac of Environmental Trends."

The chances of seeing a properly valued, revenue-neutral carbon tax are about as likely as the chances of seeing a unicorn-powered spaceship. The idea would cause nothing but misery. Here are a few reasons why:

The Environmental Protection Agency will celebrate the fortieth anniversary of the Clean Air Act, but the Clean Air Act cannot handle today's pollution problems and time to really celebrate will come when the Clean Air Act is itself reformed to make it capable of dealing with today's challenges.