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Old growth forest
Old growth forest, sometimes called late seral forest or ancient forest or primary forest is an area of forest that has attained great age and exhibits unique biological features. Old growth forests ... > more -
Ocean acidification
Ocean acidification is the name given to the ongoing decrease in the pH of the Earth's oceans, caused by their uptake of anthropogenic carbon dioxide from the atmosphere. Between 1751 and 2004 ... > more -
List of major natural disasters in the United States
This is a list of major natural disasters in the United ... > more -
Ozone layer
The ozone layer is the part of the Earth's atmosphere which contains relatively high concentrations of ozone (O3). "Relatively high" means a few parts per million - much higher than the ... > more -
Nitrogen oxide
NOx is a generic term for the various nitrogen oxides produced during combustion. They are believed to aggravate asthmatic conditions, react with the oxygen in the air to produce ozone, which is also ... > more -
Carbon dioxide
Carbon dioxide is a chemical compound composed of one carbon and two oxygen atoms. It is often referred to by its formula CO2. It is present in the Earth's atmosphere at a low concentration and acts ... > more -
1991 Halloween Nor'easter
The 1991 Halloween Nor'easter, also known as the Perfect Storm, was an unusual and very powerful nor'easter combining an extratropical low and two hurricanes in October of ... > more
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