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World Environment Day (International Polar Year)

ice is more "water ice", the Arctic Ocean is covered by floating ice or sea ice, called the Arctic Ice pack.

In recent years there has been noticeable shrinking of polar ice. Scientists have warned that the Arctic ice cap may disappear in the next 100 years! NASA and the National Snow and Ice Data Centre together conducted a study and report that since 1978, the polar ice cap has shrunk by 30 percent. Incidentally, the Arctic summer this year was the warmest in 400 years!

The Greenland ice sheet is melting three times faster today than it was five years ago, according to a new study. The finding adds to evidence of increased global warming in recent years and indicates that melting polar ice sheets are pushing sea levels higher, the authors report. According to the study, Greenland ice loss now amounts to more than 48 cubic miles (200 cubic kilometers) each year . - John Roach (National Geographic News, 10 Aug 06).

The single reason for this mishap is anthropogenic global warming,directly implicating man and his activities. Global average air temperature around the earth's surface increased by 0.74+0.18C(1.3 0.32 F)during the last century.The Inter-governmental Panel on Climate Change (IPCC) attributes this notching up of temperature to increased greenhouse gas concentrations, caused very likely' , by human activities. It may do well for the readers to understand that such gases in turn increase the green house effect.

Greenhouse effect is similar to warming air inside a greenhouse to keep it at a higher temperature as compared to the air outside it. Technically, it refers to the emission of IR (infra red) radiations from the atmosphere, which warms the earth's surface. More commonly, it signifies the increase in temperature of the earth's surface due to emission of gases related to human activities.

The depletion of the ozone layer is also linked to the e
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