effect is a phenomenon in which the atmosphere prevents the heat
radiated from the earth surface from escaping into the space. As
heat is trapped in the Earth, the average temperature becomes higher
than normal. Since this effect is worldwide, many people call this
effect as the effect of global warming.
from the sun drives the earth's weather and climate, and heats the
earth's surface; in turn, the earth radiates energy back into space.
Atmospheric greenhouse gases (water vapour, carbon dioxide, methane
and other gases) trap some of the outgoing energy, retaining heat
somewhat like the glass panels of a greenhouse. Without this natural
"greenhouse effect," temperatures would be much lower than they
are now, and life as known today would not be possible.
greenhouse gas concentrations increasing? Scientists generally believe
that the combustion of fossil fuels and other human activities are
the primary reason for the increased concentration of carbon dioxide.
Plant respiration and the decomposition of organic matter release
more than 10 times the CO2 released by human
activities; but these releases have generally been in balance during
the centuries leading up to the industrial revolution with carbon
dioxide absorbed by terrestrial vegetation and the oceans.
global temperatures are expected to raise sea level, and change
precipitation and other local climate conditions. Changing regional
climate could alter forests, crop yields, and water supplies. It
could also threaten human health, and harm birds, fish, and many
types of ecosystems.