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Global Dimming

Environmental Science ISU

Hailey Smith

on 16 January 2013

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Transcript of Global Dimming

What is
Global Dimming? Air pollution (caused
by human activity) reflects
sunlight away from earth and
causes it to cool. The pollutants also change the
properties of clouds. Pollutants become nuclei for
water droplets within the clouds. Polluted
clouds consist of a greater number of smaller
droplets. This makes clouds more reflective and reduces the amount of sun that reaches earth. This affects rain patterns
around the world. On average the
amount of sunlight
reaching Earth has decreased
1-2% globally per decade. Some areas have seen a 30% decrease
in sunlight since the 1950's. Why is this a problem? Global dimming has already taken millions of lives. The lack of sunlight
cools the oceans where many
clouds form. The water in the
oceans become to cold to evaporate. Therefore, there is less rain in some areas. It is dangerous to stop global dimming due to global warming. It is offsetting global warming and hiding its potential danger. water droplets in an
unpolluted cloud water droplets in a
polluted cloud Global Dimming Millions of people in Northern Africa have died and 50 million people suffered from starvation during the 70s and 80s because of droughts caused by failed rains attributed by global dimming. Climate models predict a 5 degree increase in the global average temperature over the next century. Global warming may have been underestimated because effects of global dimming. Cleaning up the causes of global dimming increases the severity of the effects of global warming. Who is involved? Best case scenario Companies/Factories

Oil Companies

Countries reliant on production


Hydro Companies

Countries reliant on rain are opposed to finding alternative and sustainable energy sources because it will cost them more than if the used fossil fuels. control the economy in most parts of the world. Reducing the use of fossil fuels would put oil companies out of business and significantly hurt the economy. , who mass produce things to export, may not be willing to find alternative sources to power their factories because it would ruin their economy. rely on rain and proper growing conditions to make money and provide food for the community. Farmer in developing countries do not have the financial means to find other water sources. rely on rain water to create the currents that form hydro electricity that power different communities. as a main or only water source for food production and drinking water can be devastated by failed rains. These countries usually have weak governments and economies that cannot provide help. The causes of global dimming hurts human health and environmental health. Soot and smog create health problems such as asthma and other respiratory problems as well as environmental problems such as acid rain which can destroy ecosystems. The best case scenario would be countries becoming less reliant on oil and fossil fuels and use solar or wind power instead. The causes of global dimming as well as global warming would have be addressed. Otherwise global warming would worsen as global dimming decreased. More people would find water sources other than rain water such as ground or well water. People living in at risk area What can you do? Use less heating and air conditioning.
Use a push or electric lawn mower instead of a gas powered mower.
Wash clothes in cold water.
Don't smoke and convince others to stop smoking.
Buy energy efficient products.
Buy products with minimum amounts of plastic.
Use public transit.
Avoid nylon and polyester products.
Drive less.
Full transcript