Green house effects

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categorie: Engleza

nota: 9.48

nivel: Liceu

Global Warming Is a Problem
Expecting The Unexpected : "We're altering the environment far faster than we can possibly predict the consequences. This is bound to lead to some surprises."

--Dr. Stephen Schneider, National Center for Atmospheric Research
Nasty Surprises: Some of the ways that Earth may respond to global warming could be gradual; others could be rapid. B[...]
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Global Warming Is a Problem
Expecting The Unexpected : "We're altering the environment far faster than we can possibly predict the consequences. This is bound to lead to some surprises."

--Dr. Stephen Schneider, National Center for Atmospheric Research
Nasty Surprises: Some of the ways that Earth may respond to global warming could be gradual; others could be rapid. By continuing to add greenhouse gases to the air, we may be surprised by some nasty changes.

Escaping Methane: As the Arctic warms, huge amounts of methane now frozen under the ocean and land could escape into the air. Because methane is a greenhouse gas that traps heat in the atmosphere, these added emissions could cause the Earth to warm even faster than now expected.

Rapid Sea Level Rise: Part of the West Antarctic ice sheet rests precariously on the sea floor. As the sea warms, the ice might become destabilized, break up and melt. As a result, over the next 300 years sea level would rise faster than currently predicted.

Change of Course: Warmer water temperatures might lead to changes in the course of major ocean currents. Their paths determine the distribution of ocean temperatures and nutrients that sustain marine life. If the currents were to change direction, entire marine ecosystems could be disrupted.

The Ozone Hole Not to Be Confused With the Greenhouse Effect
Chlorofluorocarbons (CFCs) and related industrial gases have thinned the ozone layer in many places. The ozone hole is the area over Antarctica where damage has been the greatest. The icy clouds there speed up chemical changes initiated by CFCs that resul t in destroying ozone. Ultraviolet light passing through damaged areas can harm many forms of life on Earth. In humans, ultraviolet light can cause skin cancer and cataracts.

The ozone layer, a blanket of gas in the upper atmosphere, shields the Earth from the sun's harmful ultraviolet rays. The ozone hole, a gap in this layer, does not intensify the greenhouse effect and should not be confused with it.
The "good" protective ozone layer in the upper atmosphere should be distinguished from "bad" ozone in the lower atmosphere, a major component of smog.
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