global warming

michelleenguillo99 — Sun, 18 Oct 2009 06:27:49 +0000

Global warming is the increase in the average temperature of the Earth’s near-surface air and oceans since the mid-20th century and its projected continuation. Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F ) during the last century. The Intergovernmental Pannel Climate Change (IPCC) concludes that most of the observed temperature increase since the middle of the 20th century is caused by increasing concentrations of greenhouse gasses resulting from Human activity such as fossil fuel burning and deforestation. The IPCC also concludes that variations in natural phenomena such as solar radiation and volcanoes produced most of the warming from pre-industrial times to 1950 and had a small cooling effect afterward. that the gloasurface temperature will probably rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century. The uncertainty in this estimate arises from the use of models with differing sensitivity to greenhouse gass concentration and the use of differing emissions. Some other uncertainties include how warming and related changes will vary from region to region around the globe. Most studies focus on the period up to the year 2100. However, warming is expected to continue beyond 2100 even if emissions stop, because of the large heat capacity of the oceans and the long lifetime of carbon dioxide in the atmosphere. An increase in global temperature will cause sea levels to rise and will change the amount and pattern of percipitation, probably including expansion of subtropical deserts. The continuing retreat of glaciers, permafrost and sea ice is expected, with warming being strongest in the Arctic . Other likely effects include increases in the intensity of extreme weather events, species extinctions, and changes in agricultural yields.

Newspaper articles about global warming tell the story of the Earth’s climate and the diverse opinions and scientific discoveries surrounding the theory of global warming. Though many people argue over the theory’s validity, global warming is a subject that affects us all and newspapers chronicle its discovery and the debate surrounding the issue.

Since ancient times, people have believed that human activity could affect the environment. The discovery of past ice ages shows that Earth’s climate is in constant flux and that throughout history, scientists have searched for the cause of these changes. Though scientists discovered the green house effect in the late 19th century, the theory of global warming wasn’t accepted as a scientifically proven fact until 1992 when the United Nations held a Conference on Environment and Development. Today, global warming is a widely accepted reality and speculation about its effects range from the hysteria to the acceptance. Newspapers chronicle the slowly changing climate and the actions that have affected that change. The Global Warming Archive provides access to thousands of articles on the environment and the scientists who documented its change.

From developing nations to industrial countries, global climate affects everyone and newspaper articles tell the story of nature’s dramatic impact on history. The largest newspaper database available online, has provided a free archive on the history of global warming granting access to thousands of original newspaper articles. The archive includes articles on the early discoveries of scientists, the development of technology, pollution, the greenhouse effect and global summits and treaties dedicated to the topic of global warming. Click on the timeline above to view newspapers in chronological order or begin searching newspaper articles with your own key words.

5 Deadliest Effects of Global warming

1. Polar ice caps melting
The ice caps melting is a four-pronged danger.

First, it will raise sea levels. There are 5,773,000 cubic miles of water in ice caps, glaciers, and permanent snow. According to the National Snow and Ice Data Center, if all glaciers melted today the seas would rise about 230 feet. Luckily, that’s not going to happen all in one go! But sea levels will rise.

Second, melting ice caps will throw the global ecosystem out of balance. The ice caps are fresh water, and when they melt they will desalinate the ocean, or in plain English – make it less salty. The desalinization of the gulf current will “screw up” ocean currents, which regulate temperatures. The stream shutdown or irregularity would cool the area around north-east America and Western Europe. Luckily, that will slow some of the other effects of global warming in that area!

Third, temperature rises and changing landscapes in the artic circle will endanger several species of animals. Only the most adaptable will survive.

Fourth, global warming could snowball with the ice caps gone. Ice caps are white, and reflect sunlight, much of which is relected back into space, further cooling Earth. If the ice caps melt, the only reflector is the ocean. Darker colors absorb sunlight, further warming the Earth.

2. Economic consequences
Most of the effects of anthropogenic global warming won’t be good. And these effects spell one thing for the countries of the world: economic consequences. Hurricanes cause do billions of dollars in damage, diseases cost money to treat and control and conflicts exacerbate all of these.

Green house gases stay can stay in the atmosphere for an amount of years ranging from decades to hundreds and thousands of years. No matter what we do, global warming is going to have some effect on Earth. Here are the 5 deadliest effects of global warming.

3. Spread of disease
As northern countries warm, disease carrying insects migrate north, bringing plague and disease with them. Indeed some scientists believe that in some countries thanks to global warming, malaria has not been fully eradicated

4. Warmer waters and more hurricanes
As the temperature of oceans rises, so will the probability of more frequent and stronger hurricanes. We saw in this in 2004 and 2005.

5. Increased probability and intensity of droughts and heat waves
Although some areas of Earth will become wetter due to global warming, other areas will suffer serious droughts and heat waves. Africa will receive the worst of it, with more severe droughts also expected in Europe. Water is already a dangerously rare commodity in Africa, and according to the Intergovernmental Panel on Climate Change, global warming will exacerbate the conditions and could lead to conflicts and war.

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michelleenguillo99 — Sun, 18 Oct 2009 05:49:22 +0000

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