Global Heat Wave
Global warming is an increase in the average temperature of the Earth’s near-surface air and oceans. Although global warming has occurred in the past, the term is most often used to refer to the warming some scientists predict will occur as a result of increased emissions of greenhouse gases.
Global average air temperature near Earth’s surface rose 0.74 ± 0.18 °Celsius (1.3 ± 0.32 °Fahrenheit) in the last century. The Intergovernmental Panel on Climate Change (IPCC) concludes, “most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations,” which leads to warming of the surface and lower atmosphere by increasing the greenhouse effect. Other phenomena such as solar variation and volcanoes have had a small neutral or slight cooling effect on global mean temperature since 1950. While this conclusion has been endorsed by numerous scientific societies and academies of science, there are a few scientists who disagree about the primary causes of the observed warming.
Models referenced by the IPCC predict that global temperatures are likely to increase by 1.1 to 6.4 °C (2.0 to 11.5 °F) between 1990 and 2100. The range of values reflects the use of differing scenarios of future greenhouse gas emissions as well as uncertainties regarding climate sensitivity. Although most studies focus on the period up to 2100, warming and sea level rise are expected to continue for more than a millennium even if no further greenhouse gases are released after this date. This reflects the long average atmospheric lifetime of carbon dioxide (CO2).
An increase in global temperatures can in turn cause other changes, including a rising sea level and changes in the amount and pattern of precipitation. There may also be increases in the frequency and intensity of extreme weather events, though it is difficult to connect specific events to global warming. Other consequences include changes in agricultural yields, glacier retreat, reduced summer streamflows, species extinctions and increases in the ranges of disease vectors.
Remaining scientific uncertainties include the exact degree of climate change expected in the future, and especially how changes will vary from region to region across the globe. A hotly contested political and public debate also has yet to be resolved, regarding whether anything should be done, and what could be cost-effectively done to reduce or reverse future warming, or to deal with the expected consequences. Most national governments have signed and ratified the Kyoto Protocol aimed at combating greenhouse gas emissions.
Click on the Map to listen to a podcast of this post
Yesterday we read an article from TFK on the Genocide that is taking place in the Sudan. Today we are writing to our elected officials to tell them we want them to help stop the evil things that are happening in the Sudan in Darfur. You can blog your thoughts here on what you would like to express to our leaders. I think we will forward letters to our Councilman, Congressman, Mayor, Governor, and President . Refer to the Article when writing your comments.
Heres are some points to remember:
- For the past four years, the Darfur region of Sudan, in Africa, has been ripped apart by violence.
- More than 200,000 people have been killed
- 2.5 million have been driven from their homes. 2.5 million have been driven from their homes.
- Every month thousands of refugees die as a result of disease, malnutrition and lack of clean. water.
What is global warming?
Global warming is the rise in temperature of the earth’s atmosphere. It’s said that by the time a baby born today is 80 years old, the world could be 11 degrees warmer than it is now.
Is global warming bad?
The earth is naturally warmed by rays (or radiation) from the sun which pass through the earth’s atmosphere and are reflected back out to space again. The atmosphere’s made up of layers of gases, some of which are called ‘greenhouse gases’. They’re mostly natural and make up a kind of thermal blanket over the earth.
This lets some of the rays back out of the atmosphere, keeping the earth at the right temperature for animals, plants and humans to survive (60°F/16°C).
So some global warming is good. But if extra greenhouse gases are made, the thermal blanket gets thicker and too much heat is kept in the earth’s atmosphere. That’s when global warming’s bad.
What are the greenhouse gases?
Greenhouse gases are made out of:
- water vapour
- carbon dioxide
- nitrous oxide
- chlorofluorocarbons (CFCs)
How are extra greenhouse gases produced?
Extra greenhouse gases are produced through activities which release carbon dioxide, methane, nitrous oxide and ozone CFCs (chlorofluorocarbons). These activities include:
- Burning coal and petrol, known as ‘fossil fuels’
- Cutting down of rainforests and other forests
- Animal waste which lets off methane
What’s the ‘ozone layer’ got to do with global warming?
The ozone layer is another important part of the atmosphere. It’s made up of ozone (a type of oxygen) that protects the earth from too many harmful rays called UVB.
Some greenhouse gasses damage it, letting in the harmful rays which could raise the Earth’s temperature.
So what could happen?
If Earth gets hotter, some of the important changes could happen:
- Water expands when it’s heated and oceans absorb more heat than land, so sea levels would rise.
- Sea levels would also rise due to the melting of the glaciers and sea ice.
- Animals like polar bears, which live on the ice, might die out.
- Cities on coasts would flood.
- Places that usually get lots of rain and snowfall might get hotter and drier.
- Lakes and rivers could dry up.
- There would be more droughts making hard to grow crops.
- Less water would be available for drinking, showers and swimming pools.
- Some plants and animals might become extinct because of the heat.
- Hurricanes, tornadoes and other storms which are caused by changes in heat and water evaporation may get more common
Looking Evil in the Face
President Bush calls for an end to violence in Sudan
For the past four years, the Darfur region of Sudan, in Africa, has been ripped apart by violence. More than 200,000 people have been killed and 2.5 million have been driven from their homes. Each month, thousands of refugees die as a result of disease, malnutrition and lack of clean water. On Wednesday, President George W. Bush, said the bloodshed must stop. “The brutal treatment of innocent civilians in Darfur is unacceptable,” said Bush. “(It) must end.”
ALFRED DE MONTESQUIOU—AP
The President said that the United States would take concrete measures to force the government of Sudan to abide by peace agreements. If Sudan’s government fails to act properly, the U.S. will impose strict economic penalties on Sudan. American companies will be barred from doing business with Sudan. Individuals committing violent acts in Sudan will not be allowed to do business with American citizens or companies.
The world must actBush spoke at a ceremony at the Holocaust Memorial Museum in Washington, D.C. The museum is devoted to preserving the memory of the estimated 6 million Jewish people who were killed by members of Germany’s Nazi Party during World War II. This week marks Holocaust Remembrance Week. Bush said that the museum serves as a reminder to the world that it must not allow evil acts to be committed. “The only way to defeat (evil) is to look it in the face, and not back down,” he said.
The President compared the Nazis’ plan to exterminate the Jewish people with the crisis in Darfur. “Genocide is the only word for what is happening in Darfur, and we have a moral obligation to stop it,” Bush said.
Google, an Internet search company, has joined ranks with the Holocaust Museum to let the world see what is going on in Darfur. By using Google Earth, people can view the destruction in Darfur. They can see burnt-out homes, makeshift tent villages and people struggling to survive.
Broken promisesThe problems in Darfur began with an uprising of black Africans against what they viewed as discrimination by the predominantly Arab government. Both groups are Muslim. In response, Sudan’s president, Omar al-Bashir, called on local tribes to put down the rebellion. Armed Arab bandits, called Janjaweed, began attacking black African farmers.
The United States and the United Nations (U.N.) have brokered several agreements between the Sudanese government and rebel groups. The Sudanese government has promised to disarm the Janjaweed. This week, the government agreed to accept 3,000 U.N. troops, who will work with African Union forces to try to bring security and peace to the region.
But the Sudanese government has a history of breaking its agreements. “The time for promises is over,” vowed Bush. “President Bashir must act.”
Photos Above Rube Foster and Unknown Tearm from 1940’s
Click on the Document nl-begins.doc
Download it to your computer. Read the Article and answer the questions. You may work in groups of two. Type your answers in the blank spaces provided. When Finished print your document and hand it in.
You can also read the article on line at NL Musuem http://www.nlbm.com/s/history.htm
BOTH CLASSES OUR WORKING TOGETHER ON A PROJECT ABOUT GLOBAL WARMING FOR OUR MULTI-MEDIA FAIR.
WE WILL BE MAKING SEVERAL TECH PROJECTS/ POWER-POINTS AND A MOVIE ABOUT GLOBAL WARMING.
TODAY LETS DO OUR FIRST BLOG PIECE. (THESE WRITTEN BLOG PIECES ARE ACTUALLY THE FOUNDATION OF OUR TECH PROJECTS AS MOVIE AND POWERPOINTS WILL COME FROM OUR BLOG PIECES ABOUT GLOBAL WARMING.)
WRITE A FEW SENTENCES ABOUT GLOBAL WARMING ANSWERING THE FOLLOWING QUESTIONS
1. WHAT IS GLOBAL WARMING?
2. WHAT IS CAUSING GLOBAL WARMING?
3. WHAT ARE SOME OF THE EFFECTS ON ANIMALS, HUMANS, AND THE POLAR ICECAPS WE CAN
EXPECT TO SEE DUE TO GLOBAL WARMING?
4. WHAT CAN BE DONE TO SLOW DOWN GLOBAL WARMING.
INCLUDE FACTS AND YOU CAN REFER TO THE SHORT MOIVE I MADE FOR YOU ON GLOBAL WARMING OR OR ONE OF THESE LINKS AS A RESOURCE FOR INFORMATION
CLICK ON THE PICTURE BELOW TO WATCH THE MOVIE.
WHEN YOU ARE READY BLOG YOUR RESPONSE TO THE QUESTIONS BY CLICKING ON THE COMMENT BUTTON.
Read the Time for Kids Article on Cyber-bullying?
Have you ever experienced this? What can be done to protect kids from bullying in Cyber-space?
What would you do if someone threatened you via email, text-messaging or chat? Would you tell your parents, teacher, principal? Do you think there should be a law against cyber-bullying?
Tell what you Think.