Question

Global warming can be controlled by
A. Reducing reforestation, increasing the use of fossil fuel
B. Increasing deforestation, slowing down the growth of the human population
C. Increasing deforestation, reducing the efficiency of energy usage
D. Reducing deforestation, cutting down the use of fossil fuel

Answer 1

Hint:- In an ecosystem, all the biotic (living factors) and abiotic (non-living factors) components interact with each other. This interaction is always inter-related, interdependent and mutually reactive in a balanced and healthy ecosystem. Thus the ecosystem is referred to as the self-regulatory and self-sustaining functional and structural unit of nature. All the organisms present in an ecosystem (visible or not) have a definite role to play in maintaining the balance of the ecosystem.

Complete Answer:-In modern times the loss of biodiversity is increasing which causes serious damages to the whole earth as an ecosystem (biome). The loss of biodiversity in a region may lead to a decline in plant production, lowered resistance to environmental calamities such as drought, increased variability to certain ecosystem processes such as plant productivity, water use and disease cycles. The accelerated rates of species extinctions are largely due to human activities. The major causes for the accelerated biodiversity loss are habitat loss and fragmentation or deforestation.
Due to deforestation, the area covered by rainforests decreased so severely that the water cycle of the earth is disturbed to a large extent. A higher concentration of carbon dioxide forms a thick layer above the earth's surface, checking the radiation of the heat from the earth surface. Because of this, the temperature of the earth's surface increases, this is called global warming.
Cutting down of trees will reduce the carbon dioxide fixation from the environment and its concentration will increase up to a certain level. This will ultimately cause global warming. So more and more trees should be grown to decrease the global temperature of the earth. This process is called reforestation. Also, fossil fuels, when burned, produce large quantities of carbon dioxide. This will also increase global warming. Thus reducing deforestation and cutting down the use of fossil fuels will decrease global warming.

Thus the correct answer is Reducing deforestation, cutting down the use of fossil fuel, option (D).

Note:- Global warming is also termed as the greenhouse effect. In this phenomenon, the cover of the carbon dioxide layer around the earth allows the short wavelength of incoming solar radiation to come in but does not allow the long wavelength of outgoing radiation from the warm surface of the earth and this will keep the earth warm. This consequent increase in global mean temperature is referred to as global warming.