Greenhouse Effect

The greenhouse printing, in environmental science, is a popular condition for the

effect that certain variable constituents of the Earths lower zephyr break on

rise up temperatures. These gases--water vapor (H2O), carbon dioxide (carbonic acid gas), and

methane (CH4)--keep ground temperatures at a global come of about 15 degrees

C (60 degrees F). Without them the average would be below the halt point of

H20. The gases have this effect because as incoming solar radiation strikes the

surface, the surface gives off infrared radiation, or heat, that the gases freeze and

keep near ground level. The effect is comparable to the way in which a greenhouse

traps heat, hence the term.

        Environmental scientists are concerned that changes in the variable contents

of the atmosphere (particularly changes caused by human activities) could cause the

Earths surface to warm up to a dangerous degree. Even a limited rise in average

surface temperature might lead to at least partial tending of the polar ice caps and

hence a major rise in sea level, along with separate severe environmental agitation. An

example of a runaway greenhouse effect is Earths near-twin planetary neighbor

Venus. Because of Venuss thick CO2 atmosphere, the planets cloud-covered

surface is hot enough to melt lead.

        Water vapor is an important greenhouse gas.



It is a major condition why

humid regions experience less cooling at night than do dry regions. However,

variations in the atmospheres CO2 content are what have played a major role

in past climatic changes. In recent decades there has been a global increase in

atmospheric CO2, largely as a result of the burning of fossil fuels. If the many

other determinants of the Earths enclose global climate remain more or less

constant, the CO2 increase should raise the average temperature at the Earths

surface. As the atmosphere warmed, the amount...

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