global warming

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Presentation Description

this is a ppt made for class presentation by my classmates and i ,it mainly discussed about the hot issue of global warming and solutions to the problem。

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Presentation Transcript

Global Warming : 

Global Warming

Today’s talk : 

Today’s talk General introduction of global warming Explanation of the causes of global warming Explanation of the effects of global warming Solutions to the problem

Introduction : 

Introduction Global warming is the increase in the average temperature of the Earth's near-surface air and oceans since the mid-twentieth century and its projected continuation. You can picture it as a blanket of gases that wraps around the Earth and holds the heat in. Carbon dioxide is the most common gas that causes global warming.

Slide 20: 

Global surface temperature increased 0.74 ± 0.18 °C during the last century. As global temperatures increase, the climate changes.

Explanation of the causes of global warming : 

Explanation of the causes of global warming The main cause of global warming is our treatment of Nature

Slide 25: 

1  The increased burning of fossil fuels and thus increases the emission of greenhouse gases into the Earth’s atmosphere. Some greenhouse gases are produced naturally while others are the direct result of human activities. Natural greenhouse gases include carbon dioxide, methane, nitrous oxide, ozone and water vapor. Human activities then increase the amount of these gases produced naturally.

Slide 26: 

2 Human activities. Several human activities increase the emission of certain greenhouse gases into the atmosphere. When fossil fuels such as oils, natural gas, and coal, in addition to wood, wood products, and solid waste are burned they emit Carbon Dioxide. Methane is emitted during such activities as the production and transportation of certain natural gases, coal, and oil.

Slide 27: 

3 The raising of livestock and the decomposition of organic wastes in solid waste landfills also have resulted in the emission of Methane. During both industrial and agricultural activities and the combustion of solid waste and fossil fuels nitrous oxide is emitted. The actual percentage of Carbon dioxide recorded is and increase by 31% since 1750 and about ¾ of this increase is from deforestation and the burning of fossil fuels.

Slide 28: 

4 Forest destruction and population Advances in technology have increased the human population thus resulting in damaging Earth’s resources. For example, the Industrial Revolution caused a rapid growth in population. In turn, oils and gas were subjugated to our use. Carbon dioxide increases are in a direct relationship to population growth. The overpopulation of Earth and the increasing use of technologies are only destructive to the limited natural resources that Earth holds.

Slide 29: 

5 In addition, forests play an important role in the cycle of carbon dioxide in the atmosphere. Trees are the largest known natural mechanism for removing carbon dioxide from the air. This is because they possess a large storage space for carbon dioxide in their structures. As the process of deforestation continues, the more and more carbon dioxide is unable to be stored by the existing trees. Thus, forest destruction only creates more heat.

Explanation of the effects of global warming : 

Explanation of the effects of global warming

Slide 31: 

The predicted effects of global warming not only impact the environment, but human life as well. Effects of global warming on the environment include glaciers, ecosystems, ocean currents, and sea level. Impacts on the human level include financial matters and the spread of disease.

Slide 32: 

On glaciers. Global warming has so far and will continue to have negative effects on the glacier mass balance. From 1900-1980 there has been a recorded decline from 144 to 142 mountain glaciers. From 1980 to 2002 there has been a recorded net decline in all but a few mountain glacier masses.

Slide 33: 

Predicted impacts on the ecosystems and ocean currents. The continued increase in temperature will scientifically lessen the snow cap, create a rise in sea level, and produce weather changes. The combination of the effects of global warming will cause a change in the ecosystems. This change can potentially force animals out of their habitats endangering their existence and possibly even forcing them into extinction, while other animals may flourish. There is also the belief that global warming can affect ocean currents.

Slide 34: 

On human life Global warming has the ability to increase the areas that bread such diseases as malaria, bluetongue disease, Hantavirus infection, Crimean-Congo hemorrhagic fever, tularemia, and rabies.

Slide 35: 

Increase the height of sea level. A slight increase in sea level will make some densely populated coastal areas completely uninhabitable. For example, if the sea level raised a total of 4 meters practically every coastal city in the world would be drastically impacted creating major impacts on the world’s trade and economy. Within the next millennium a predicted 200 million people will be devastated with loss due to an irreversible glacier melt and rise in sea level. By 2100 the sea level is probably to rise 1 meter.

Solutions to the problem : 

Solutions to the problem The world’s electricity is based primarily on the burning of coal, so one should decrease the amount and their demand of electricity or try and use other methods such as solar powered. By simply decreasing the electric power use, one is not only reducing the global warming problem but also breathing in cleaner air and saving money.

Slide 37: 

The second decrease should be in the use of one’s car by perhaps joining a carpool or using public transportation. There are also fuel-efficient cars that are being mass produced. By either decreasing the overall use of one’s car or replacing it with a fuel-efficient or hybrid automobile, one is not only helping in the reduction of greenhouse gas emission but is also saving money on parts, repairs, gas, and oil.

Slide 38: 

The third and easiest prevention method would be to simply recycle.

Slide 39: 

Thank you! ?? ?? ??? ???