Sadra Sepehri D block 12/12/2011 What is Global Warming?
Global Warming is the gradual increase in the temperature of Earth
“ Evidence continues to build that the world is slowly but surely getting warmer.”- James Hansen
Earth temperature has warmed up by 1.5 degrees Fahrenheit since 1900
How are human activities causing global warming?
Burning fossil fuels releases CO 2 in atmosphere.
More CO 2 means “thicker” atmosphere causing more heat to be trapped in the Earth’s atmosphere.
Coal burning plants produce 2.5 billion tons of CO 2 every year
Automobiles create nearly 1.5 billion tons of CO 2 annually
1 gallon of gas produces up to 19 pounds of CO 2
How can we reverse the effects of global warming ?
We should stop pumping CO 2 into Earth’s atmosphere
Economies should start using cleaner cars
Countries should use more renewable energy such as wind energy, solar energy ,hydraulic energy, geothermal energy etc.
Scientists should develop technology to cut the amount of carbon dioxide
Should a national policy be implemented? Why or why not?
International cooperation is needed because emissions to the atmosphere circulate worldwide.
Benefits of climate change will be worldwide too
Some examples of those benefits are climate stabilization and health
Incentives, and economic opportunities are also ways to stop global warming
Should a national change policy be implemented? Why or why not? ( cont.)
United Nations held an earth summit in 1992 ( Rio de Janeiro)
All countries should agree to work together because it is something that affects everyone
Many countries met in Kyoto, Japan and signed an agreement called Kyoto Patrols
U.S. and Australia haven’t agreed yet because they are afraid that reduction in energy could harm their economy and make unemployment worse.
How does Greenhouse emission cause global warming?
The sun’s rays heat the earth’s land and sea and make it livable for humans and other living things
More than one-third of the heat bounces back off the earth’s surface but greenhouse gases capture the heat
Some of the greenhouse gases are carbon dioxide ( most important one), methane (CH 4 ), nitrous Oxide (N 2 O), Ozone ( O 3 ), water vapor, halocarbons
The process is called “greenhouse emission” because it is similar to the way glass traps the heat inside a green house
Natural green house effect makes a big deference to temperature of our earth
Without it, the average temperature is 0 degrees Fahrenheit, but with it average temperature is 50 degrees Fahrenheit
Greenhouse effect is now stronger and can trap more of sun’s energy
What are the impacts of global warming?
The greatest impact of global warming is the increase in extreme weather
Arctic’s perennial polar ice cap is decreasing at the rate of 9% per decade
Global warming doesn’t make hurricanes, but it makes them stronger
Rising sea level will lead to coastal flooding ( Florida, Gulf of Mexico and etc.)
Other great impacts of global warming are more common and intense. For instance, heat waves, rising average air temperature over land and sea, warmer Springs and longer summers
Atmospheric scientists mostly study the atmosphere
surrounding our Earth. Also, they analyze the changes in the atmosphere that might affect the rest of our environment. For example, atmospheric scientists forecast the weather, study the weather in the past years, and examine the current weather