africa for africans
GLOBAL WARMING Global warming is the increase of earth’s average temperature as the result of green house effect. Green house gases in the atmosphere act like a mirror reflecting back the heat radiation which would otherwise be dispersed into space. Greenhouse effect is the problem of gradual rise of gases such as carbon dioxide in the air surrounding the earth which traps the heat if the sun. Greenhouse gases are any of the gases that are thought to cause green house effect.
Carbon dioxide is the main green house gas. The gas contributes over 50% of green house effect. The following are some of the sources of carbon dioxide in the environment or the atmosphere.
The main human activities that contribute to global warming are the burning of fossils (coal, oil and natural gas). The burning of fossils creates carbon carbon dioxide in the atmosphere.
Also clearing and burning of vegetations, green plants especially woody plants, absorb carbon dioxide from the atmosphere and they use it to produce their own foods.
When the wood dies the carbon dioxide will be released back in the atmosphere. So when
We loose trees and forest there will be fewer trees to absorb the carbon dioxide.
However Methane seems to contribute more since many of the SADC communities depend on agriculture. Methane is from agriculture activities it’s released from wetlands. The emission of methane gas increase with increase in agricultural activities, since 1960’s the amount of methane in the air has increased by 1% per year. Methane is also produced during mining of coal, oil and when vegetation burnt. Methane molecules have life time of 10 years in the atmosphere. SADC will be much harder hit than developed countries, due to limited agricultural flexibility.
Chlorofluorocarbon (CFCs) the source of CFCs in the atmosphere include fridges, air conditional and aerosols. CFCs are extremely affecting green house gases. A
Carbon dioxide is the main green house gas. The gas contributes over 50% of green house effect. The following are some of the sources of carbon dioxide in the environment or the atmosphere.
The main human activities that contribute to global warming are the burning of fossils (coal, oil and natural gas). The burning of fossils creates carbon carbon dioxide in the atmosphere.
Also clearing and burning of vegetations, green plants especially woody plants, absorb carbon dioxide from the atmosphere and they use it to produce their own foods.
When the wood dies the carbon dioxide will be released back in the atmosphere. So when
We loose trees and forest there will be fewer trees to absorb the carbon dioxide.
However Methane seems to contribute more since many of the SADC communities depend on agriculture. Methane is from agriculture activities it’s released from wetlands. The emission of methane gas increase with increase in agricultural activities, since 1960’s the amount of methane in the air has increased by 1% per year. Methane is also produced during mining of coal, oil and when vegetation burnt. Methane molecules have life time of 10 years in the atmosphere. SADC will be much harder hit than developed countries, due to limited agricultural flexibility.
Chlorofluorocarbon (CFCs) the source of CFCs in the atmosphere include fridges, air conditional and aerosols. CFCs are extremely affecting green house gases. A