Page 81 - Science Class 07

Deforesta on areas than above rural areas due to concent-

Vast swatches of primary forests are being rated usage of fossil fuels, electricity, etc. As
wiped out to make way for unsustainable urban areas grow, so will the number of heat
farming, urbanisa on or for logging and the islands, which will drive up the overall
produc on of paper goods. Trees absorb atmospheric temperature. A side effect of this
carbon dioxide from the atmosphere, so as is that water vapour above urban areas will also
more trees are cut down, the level of carbon be driven up, causing more clouds and rain.
dioxide in the air will increase. In short, Sulphates, Organic Carbons and Aerosols
deforesta on affects climate in a big way. (small par cles)

Urbaniza on These are actually nega ve forcers, but
As our popula on increase and our ci es reach warming and cooling aerosols can change some

maximum capacity, we start to expand them of the processes of clouds. As nega ve forcers,
that is called urban sprawl. This decreases the clouds reflect sunlight back up. As posi ve
amount of vegeta on available to absorb forcers, they trap outgoing heat.
carbon dioxide. In turn, urbanisa on means One cause of climate change that is up for
more greenhouse gas, pollu on and waste debate as to whether, it is natural or man-
output. made is our very own respira on. Every breath

Other damaging side effects of urbanisa on we take releases carbon dioxide into the atmos-
include the Heat Island Effect: air and surface phere. Whatever it is, we all impact climate
temperatures are driven higher above urban change, so we should all make the effort to
slow it down too.

Heat : A form of energy that determines the hotness of a body
Adaptation : Natural process through which living forms modify their body parts
so as to survive in a particular climate
Climate : Weather conditions that prevail in a particular region for a longer
period of time

Blubber : At thick layer of fat under the fur of some animals
Metabolic : Related to digestive system
Cold-blooded animals : Animals which do not control their body temperature as we do

Amphibians : Animals that live both on land and in water
Hibernation : Cold-blooded animals go inside the earth surface to avoid cold
season, this process is called hibernation
Torrid zone : Hot climate zone

Frigid zone : Very cold climate zone
Temperate zone : The regions having average temperature

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