84 post

*Sigh* tmr haf chinese oral..

YAY!! i just cancelled today's tution session.Not tat i hate tuition but haf tests tmr..I haf one but my sis haf 3

cant commit all these to memory..maybe i shld type it out..

Greenhouse Effect
-a natural process which helps to make earth a warm n comfortable place.
-some sun's ray passing thrugh e atmosphere r reflected by earth's surface
-heat from rays may be lost to outer space
-gases in atmosphere traps heat n keeps it n warms e earth.

Global Warming
-a rise in temp throughout e wrld.
-believed to be caused by an increase in amt of greenhse gases in atmosphere

Greenhouse Gases
Carbon Dioxide
-produced when living things breathe->used up by plants to photosynthesize
-However,human activities haf cause excessive carbon dioxide to be produced
-Destruction of wrld's forest ->less plants to remove carbon dioxide

Methan
-produced by bacteria in swampy areas,rearing of livestocks,decomposition of organic waste,when cows belch
-increase in population->increase in rice production
-Wet rice fields wet n damp->suitable for methane-producing bacteria to thrive
-No of cow increase for meat->amt of methan increase
-each molecule trap 20x as many heat as a co2 molecule

Rising Sea Level
-temp increase->sea water vol expands->ice caps at poles melt
-ice cap contains 70% of wrld's freshwater
-If melt,released large vol of water into seas
-lead to flooding in low-lying costal areas

Climatic Change
-Increase in evaporation->more water vapour->more rainfall but not distributed evenly
-Cause droughts n water shortage in dry regions and frequent heatwaves
-Areas suffering floods n erosion cld be worst
-adversely affect growth of impt crops like rice n wheat
-higher temp encourage growth of weeds n pests
-Might lead to food shortage
-Affects animals->animals tat require cooler climate nid to migrate to cooler areas
-Lead to extinction
-Negative effects on human
-Pests n mosquito thrive in higher temp.
-Lead to increase in diseases->dengue fever,malaria
-Flood->cases of colera
-Heatwaves->death

i assume i haf bore u to death..haven i? actually tis is just for my own use..

-