Climate Change Impacts

Global warming is caused by increased atmospheric concentration of $CO _2$ and other green house gases. As greenhouse gases absorbs the solar energy when radiation is reflected back to the atmosphere from earth's surface and increase the earth's temperature. Eutrophication refers to the presence of excess organic compounds in water. Depletion of the ozone layer is caused by the excess release of chlorine and bromine-containing the chemical in the atmosphere. Acid rain is the result of increased sulphur and nitrogen oxide levels in the atmosphere. Slow metabolism and excretion of pesticides causes their accumulation in fat tissues of organisms and is referred to as biomagnifications. The correct answer is A.

When carbon dioxide and other air pollutants are collected in the atmosphere they absorb sunlight that has bounced from the earth’s surface. This leads to an increase in the earth's average surface temperature and is called global warming. When there is no effect of the global warming, the temperature of the Earth's surface will decrease. 

Global warming is primarily driven by the enhanced greenhouse effect caused by the accumulation of greenhouse gases like carbon dioxide in the atmosphere, which trap heat.

Global warming refers to the increase in the average temperature of earth due to an excessive amount of greenhouse gases namely CO$ _2$, CH$ _4$ etc. It can be controlled by reducing deforestation. A high plant cover utilizes the major amount of CO$ _2$ from the air. Also another method of control is cutting down the use of fossil fuels which otherwise emits greenhouse gases like CO$ _2$, N$ _2$O etc.

Scientific consensus attributes the current rapid melting of glaciers primarily to human-induced global warming, which increases atmospheric and ocean temperatures.

Global warming is caused by increased concentration of greenhouse gases (carbon dioxide is one of the greenhouse gas) in the atmosphere. Increased organic matter in lakes causes eutrophication. Ozone depletion is mainly related to the use of CFC-based products. Acid rain is the result of increased sulphur and nitrogen oxide levels in the atmosphere. Increased use of pesticides causing the death of predators will cause accumulation of nonbiodegradable compounds in the food chain. Thus, the correct answer is option A. 

The effects of an increase in global temperature include a rise in sea level rise (due to melting of snow and ice and because water above 3.98 C expands as it warms), widespread melting of snow and ice, increased heat content of the oceans, increased humidity, and the earlier timing of spring events.
Option D is correct.

Due to global warming the temperature of earth's atmosphere in increasing, and the temperature at poles is also increasing. This increase in temperature at poles will melt the ice on poles , and will melt the glaciers and after some time the poles will be iceless. This will result in increase in the level of oceans which in turn may sink the coastal land areas.

Global warming has certain changes in weather that inturns changes rainfall patterns that increases disease,so only option incorrect is decreament in deseases.

• The Arctic, Antarctic, Siberia, and other frozen regions of the earth might experience more plant growth and milder climates.
• The next ice age could possibly be prevented.
• The Northwest passage through the formerly icy Canadian Arctic Archipelago could arguably open up to transportation.
• Fewer deaths or injuries would occur due to arctic conditions.
• Longer growing seasons could mean increased agricultural production in some areas.
• Previously untapped oil and gas reserves might become available.

The world average temperature is rising due to the greenhouse effect caused by increasing levels of greenhouse gases, especially carbon dioxide. When the global temperature changes, the changes in climate are not expected to be uniform across the Earth. In particular, land areas change more quickly than oceans, and northern high latitudes change more quickly than the tropics, and the margins of boime regions change faster than do their cores.

• The Arctic, Antarctic, Siberia, and other frozen regions of the earth might experience more plant growth and milder climates.
• The next ice age could possibly be prevented.
• The Northwest passage through the formerly icy Canadian Arctic Archipelago could arguably open up to transportation.
• Fewer deaths or injuries would occur due to arctic conditions.
• Longer growing seasons could mean increased agricultural production in some areas.
• Previously untapped oil and gas reserves might become available.

Global heating will effect on type of crops and its various natural features.Moreover humans will feel the extra heat and also the deplete of ozone gas.

Two major mechanisms are causing sea level to rise.
First, shrinking land ice, such as mountain glaciers and polar ice sheets, is releasing water into the oceans.
Second, as ocean temperatures rise, the warmer water expands. 
The warming of the atmosphere caused by increases in greenhouse gases is melting glaciers and causing ocean water to warm and expand thermally. Both effects increase the volume of the ocean, raising its surface level.
Thus Option D is correct.

    Due to global warming the temperature of earth's atmosphere in increasing , and the temperature at poles and high mountains is also increasing . This increase in temperature will melt the ice on poles and peaks of mountain and will melt the glaciers . This will result in rise in the level of sea .