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温室效应ppt


Global warming
Made by:zhou heng yang su xiao yanrong

Background: The Greenhouse Effect
Definition:
The so-called greenhouse effect is short-wave solar radiation th

rough the atmosphere into the ground, and warming the ground after the length of radiation being released in the atmosphere by absorbing carbon dioxide and other substances, thereby creating the effect of atmospheric warming.

As we can see from the pictures on the right , the earth is getting warmer and warmer .The earth is burning in the first Picture , on the contrary , it is melting in the second picture .The both phenomenon are caused by global warming.

Global Warming Causes: A Top 5 List
Carbon dioxide emissions from fossil fuel burning power plants Carbon dioxide emissions from burning gasoline for transportation Methane emissions from animals , agriculture such as rice paddies, and from Arctic seabeds

Deforestation, especially tropical forests for wood pulp ,and farmland

Increase in usage of chemical fertilizers on croplands

Carbon dioxide emissions from fossil fuel burning power plants
Every day, more electric gadgets flood the market, and without widespread alternative energy sources, we are highly dependent on burning coal for our personal and commercial electrical supply.

Carbon dioxide emissions from burning gasoline for transportation
With our population growing at an alarming rate, the demand for more cars and consumer goods means that we are increasing the use of fossil fuels for transportation and manufacturing .Our consumption is outpacing our discoveries of ways to mitigate the effects.

Methane emissions from animals , agriculture such as rice paddies, and from Arctic seabeds
Methane is another extremely potent greenhouse gas, ranking right behind CO2.When organic matter is broken down by bacteria under oxygen-starved conditions as in rice paddies, methane is produced .

Deforestation , especially tropical forests for wood, pulp, and farmland
The use of forests for fuel is one cause of deforestation. Forests remove and store carbon dioxide from the atmosphere, and this deforestation releases large amounts of carbon, as well as reducing the amount of carbon capture on the planet.

Increase in usage of chemical fertilizers on croplands
In the last half of the 20th century, the use of chemical fertilzers has risen dramatically. The high rate of application of nitrogen-rich fertilizers has effects on the heat storage of cropland and the run-off of excess fertilizers creates 'dead-zones' in our oceans.

Global Warming Effects: A Top 5 List
Rise in sea levels worldwide More killer storms Massive crop failures Widespread extinction of species Disappearance of coral reefs

in sea levels worldwide
Scientists predict an increase in sea levels worldwide due to the melting of two massive ice sheets in Antarctica and Greenland, especially on the East coast of the US. However, many nations around the world will experience the effects of rising sea , which could displace millions of people.

in sea levels worldwide
Warmer temperatures will cause ice to melt at the earth's poles, which can lead to the sea levels rise, many islands will be drowned, some island may not exist.

More killer storms
The maximum wind speeds of the strongest tropical cyclones have increased significantly since 1981, according to research published in Nature this week. And the upward trend, thought to be driven by rising ocean temperatures, is unlikely to stop at any time soon.

Massive crop failures
“Climate change is expected to have the most severe impact on water supplies”. “Shortages in future are likely to threaten food production, reduce sanitation, hinder economic development and damage ecosystems. It causes more violent swings between floods and droughts.”

Widespread extinction of species
According to research published in Nature , by 2050, rising temperatures could lead to the extinction of more than a million species . And because we can't exist without a diverse population of species on Earth, this is scary news for humans.

Disappearance of coral reefs
A report on coral reefs from WWF says that in a worst case scenario, coral populations will collapse by 2100 due to increased temperatures and ocean acidification . The 'bleaching' of corals from small but prolonged rises in sea temperature is a severe danger for ocean ecosystems, and many other species in the oceans rely on coral reefs for their survival.

Use recycled paper

Buy minimally packaged goods
Unplug unused electronics Use public transportation Use compact fluorescent bulbs Choose vegetarian or vegan meals

Use recycled paper
Make the most of scrap paper for shopping lists, notes ,scrapbooks , t elephone ,messages, taking notes in class, etc. Recycle your paper only when it has been thoroughly used up!

Buy minimally packaged goods
Less packaging could reduce your garbage significantly, saving 1,200 pounds of carbon dioxide and $1,000 per year. Reduced packaging is not only a good idea but also very achievable

Unplug unused electronics
Save over 1,000 lbs of carbon dioxide and US$256 per year by unplugging them or switching them off at the wall using a power surgeprotector Get into the habit of switching the power off before you go to bed.

Use public transportation
Taking the bus, the train, the subway or other forms of public transportation lessens the load on the roads and reduces one's individual greenhouse gas emissions by an average of 1600 pounds per year.

Choose vegetarian /vegan meals
Choosing vegetarian foods drastically reduces agricultural water consumption and land use, and favorably impacts biodiversity. Vegetarian diets have been shown to promote good health.

the end Thank you !


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