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Report on an ecological issue - Human impacted on the atmosphere.

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Introduction

REPORT ON AN ECOLOGICAL ISSUE Human impacted on the atmosphere. The Earth's surface temperature has risen by about 1 degree in the past century, still global warming is still happening today, in our society. Evidence shows that most of the warming over the last 50 years is because of human activities. Human activities have changed the atmosphere through the buildup of greenhouse gases - mainly on carbon dioxide, methane, and nitrous oxide. The greenhouse works by trapping heat from the sun and keeps the temperature inside the atmosphere which can cause changes in temperatures. The glass panels of the greenhouse let in light but don't let the heat from escaping. This causes the greenhouse to heat up. Greenhouse gases in the atmosphere behave like the glass window. This occurred as sunlight enters the Earth's atmosphere, passing through the greenhouse gases. As it reaches the Earth's surface, land, water, and biosphere absorb the sunlight's energy. ...read more.

Middle

Increased agriculture, deforestation, industrial production, and mining also contribute to the share of emissions. Global surface temperatures have increased 0.5-1.0�F since the late 19th century. The 20th century's is the warmest years. In 1998 it was the warmest year on record. The snow cover in the Northern Hemisphere and floating ice in the Arctic Ocean have decreased. Sea level has risen 4-8 inches over the past century. Worldwide rainfall over land has increased by about one percent. Increasing concentrations of greenhouse gases are likely to increase the rate of climate. Scientists expect that the average global surface temperature could raise 0.6-2.5 � C in the next fifty years and 1.4-5.8 � C in the next century, with regional difference. Evaporation will increase as the climate warm up, which will increase average global rainfall. Soil moisture is likely to decline in many regions, and rainstorms are likely to become more frequent. Sea level is likely to rise two feet. Some greenhouse gases occur naturally in the atmosphere, while others result from human activities. ...read more.

Conclusion

Deserts may expand into existing rangelands, and features of some of our National Parks may be change. Most important impacts depend upon whether rainfall increases or decreases. Some reasons for 'not' reversing the effects of global warming are as follows: Global warming is naturally occurring; fossil fuel combustion is better than using nuclear power, where there's a risk for radioactive fallout (if we stop the usage of coal, there would be an increase in nuclear power); nuclear power plants would be a likely site for terrorist attacks where radiation levels would increase if a successful attack was planted onto a power plant. There are many reasons why we should do something about global warming. Global warming causes the overall temperature of the earth to rise and this can affect the weather. Glaciers in Antarctica are melting and this would cause sea levels to rise and can wipe out small islands. The climates will change dramatically and it will affect the biotic and abiotic parts of an ecosystems. Animals such as the red kangaroo and other desert animals will be in trouble because there will be less space for them (less deserts). ...read more.

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