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From the weather report and the news, you may notice that the climate is so changeable recently.
The changeable climate could do harm to the creatures in the world. For example, it is reported that recently because of the decreasing of the ice in north pole, the number of the norh pole bear has been reduced. A picture showed a north pole bear died from hunger and the terrible weather. Some news also said the dirts in the air increased so quickly that the enviroment has been greatly polluted in many big cities.
The reason for the changable climate could be the following. At first, due to the movements of sun, the weather could be very hot in the summer in north part of earth but extreme cold in the south part. It also brought droughts and floods in different areas which destroyed people"s residents. Secondly, the changes of climates largely depends on human"s activities. Large numbers of private vehicles have produced increasing amount of serious polluted air, CO2 and other chemicals which could be the main reason of the rising of temperature, sea level and reduction of land coverage. It is obvious that the changes of landscape and water level change the enviroments of animals, making them hard to survive.
For this phenomenon, everybody in the whole world should firstly, understand the importance of protect our enviroment. To make a peaceful earth not only for human society and other creatures. Goverments should adopt some policy such as to punish the destroyer in time. Students should be educated to do some protection for enviroment. 自己原创的。顺便练练手~有写的不好的地方请指出
- max笔记
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Evidence is gathering that human activities are changing the climate. This "climate change" could have a huge impact on our lives. The following tutorial will tell you the facts about climate change, and what effects a change in climate will have on our lives.
Global temperatures have risen by 0.6 degrees Celsius in the last 130 years. This rise in global temperatures leads to huge impacts on a wide range of climate related factors.
Levels of carbon dioxide, methane and nitrous oxide gases are rising, mainly as a result of human activities. Carbon dioxide is being dumped in the atmosphere at an alarming rate. Since the Industrial Revolution, humans have been pumping out huge quantities of carbon dioxide, raising carbon dioxide concentrations by 30%. The burning of fossil fuels is partly responsible for this huge increase. This graph shows carbon dioxide emissions increasing over the last 130 years. You can see that the rate of increase is huge.
Methane levels in the atmosphere have increased by 145% since the Industrial Revolution. This increase is a result of gas produced by livestock and paddy fields.
There are some uncertainties as to what effects a change in climate might have on the earth. To predict what might happen, we first need to start by understanding how the increase in gases such as carbon dioxide and methane affect our climate. The diagrams below show the effects of these gases on our atmosphere.
Below are some predictions of what might happen to the earth if subjected to a change in climate.
The changes may be:
a rise in global sea levels
a change in vegetation zones
an increase in disease levels
a change in ecosystems
In 1998, 46 million people live in areas at risk of flooding (BBC News, 1997). This amount could increase rapidly if sea levels rose. Scientists estimate that a sea rise of only 50 centimetres would increase the number of people at risk to 92 million. A sea level rise of 1 metre would put 118 million people at risk. Scientists believe that there will be a sea level rise of 50 centimetres over the next 40 to 100 years.
Ecosystems could be affected by a change in temperature. It has been predicted that an increase in temperature would affect species composition. Scientists also believe that up to two thirds of the world"s forests would undergo major changes. Scientists believe that deserts would become hotter, and desertification would extend and become harder to reverse.
Detailed studies are undertaken in the UK to see how climate change is affecting humans, agriculture, vegetation, the ozone layer, hydrology, invertebrates, marine life, forests, birds, and the freshwater environment. You can click on the button below to see how these indicators are changing as the climate is changing.
All these changes could occur if we carry on polluting the atmosphere with gases. There are many things we as individuals can do to help slow down any increase in global temperatures.
If we cut down on the amount of carbon dioxide we use, the rate of climate change will slow down.
One way we can cut down on the amount of carbon dioxide we use is by making less car journeys. How often do you get a lift to school when you could easily have walked? Could you share a lift with a friend so only one car would need to be used? These small differences count.
We could also use less carbon dioxide by using better insulation in our homes. This would lessen the need to burn fossil fuels such as coal and oil that give off carbon dioxide. We could also switch to using renewable sources of energy such as wind or solar power.