greenhouse gases and its effects pdf

Greenhouse Gases And Its Effects Pdf

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Human action is causing an increase in global temperature.

Because of many uncertainties, quantitative estimates of agriculturally related economic impacts of greenhouse gas emissions are often given low confidence. A major source of uncertainty is our inability to accurately project future changes in economic activity, emissions, and climate. This paper focuses on two issues. First, to what extent do variable projections of climate generate uncertainty in agriculturally related economic impacts?

Greenhouse effect

Greenhouse gases include water vapour, carbon dioxide, methane, nitrous oxide, ozone and some artificial chemicals such as chlorofluorocarbons CFCs. The absorbed energy warms the atmosphere and the surface of the Earth. The problem we now face is that human activities — particularly burning fossil fuels coal, oil and natural gas , agriculture and land clearing — are increasing the concentrations of greenhouse gases. This is the enhanced greenhouse effect, which is contributing to warming of the Earth. Step 1: Solar radiation reaches the Earth's atmosphere - some of this is reflected back into space.

The major greenhouse gases emitted by the United States as a result of human activity, and their percentage share of total U. There are other greenhouse gases that are not counted in United States or international greenhouse gas inventories:. This greenhouse effect traps radiation from the sun and warms the planet's surface. As concentrations of these gases increase, more warming occurs than would happen naturally. Source: U.

Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. In simplest terms, "greenhouse gases" let sunlight through to the earth's surface while trapping "outbound" radiation. This alters the radiative balance of the earth see Figure A. The greenhouse gases in the atmosphere act in much the same way as the glass panels of a greenhouse, which allow sunlight through and trap heat inside. The panel refers to warming due to increased atmospheric concentrations of greenhouse gases as "greenhouse warming. The solar radiation is set at percent; all other values are in relation to it.

U.S. Energy Information Administration - EIA - Independent Statistics and Analysis

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. Radiatively active gases i. Part of this radiation is directed towards the surface, thus warming it. The temperature rises until the intensity of upward radiation from the surface, thus cooling it, balances the downward flow of energy. Earth's natural greenhouse effect is critical to supporting life, and initially was a precursor to life moving out of the ocean onto land. Human activities, mainly the burning of fossil fuels and clearcutting of forests, have increased the greenhouse effect and caused global warming.

U.S. Energy Information Administration - EIA - Independent Statistics and Analysis

The greenhouse effect is a natural phenomenon that insulates the Earth from the cold of space. Greenhouse Gases Factsheet. Click PDF to download a printable version:. The Greenhouse Effect The greenhouse effect is a natural phenomenon that insulates the Earth from the cold of space.

Effects of Greenhouse Gas Emissions on World Agriculture, Food Consumption, and Economic Welfare

Of those gases, known as greenhouse gases , water vapour has the largest effect. The origins of the term greenhouse effect are unclear.


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