A couple of days ago i watched the Al Gore movie about global warming and it showed a great point about what could happen in the future and i think that he showed it in an understanding way. It showed that GLOBAL WARMING DOES EXISTS!!!!!!!!!!!!!!!!!!!

Watch and you'll see my point

Global warming -- a gradual increase in planet-wide temperatures -- is now well documented and accepted by scientists as fact. A panel convened by the U.S National Research Council, the nation's premier science policy body, in June 2006 voiced a "high level of confidence" that Earth is the hottest it has been in at least 400 years, and possibly even the last 2,000 years. Studies indicate that the average global surface temperature has increased by approximately 0.5-1.0°F (0.3-0.6°C) over the last century. This is the largest increase in surface temperature in the last 1,000 years and scientists are predicting an even greater increase over this century. This warming is largely attributed to the increase of greenhouse gases (primarily carbon dioxide and methane) in the Earth's upper atmosphere caused by human burning of fossil fuels, industrial, farming, and deforestation activities.

Average global temperatures may increase by 1.4-5.8ºC (that's 2.5 - 10.4º F) by the end of the 21st century. Although the numbers sound small, they can trigger significant changes in climate. (The difference between global temperatures during an Ice Age and an ice-free period is only about 5ºC.) Besides resulting in more hot days, many scientists believe an increase in temperatures may lead to changes in precipitation and weather patterns. Warmer ocean water may result in more intense and frequent tropical storms and hurricanes. Sea levels are also expected to increase by 0.09 - 0.88 m. in the next century, mainly from melting glaciers and expanding seawater . Global warming may also affect wildlife and species that cannot survive in warmer environments may become extinct. Finally, human health is also at stake, as global warming may result in the spreading of certain diseases such as malaria, the flooding of major cities, a greater risk of heat stroke for individuals, and poor air quality.

Climate change is very likely having an impact now on our planet and its life, according to the latest installment of a report published by the Intergovernmental Panel on Climate Change (IPCC). And the future problems caused by rising seas, growing deserts, and more frequent droughts all look set to affect the developing world more than rich countries, they add. The report is the second chapter of the IPCC's Fourth Assessment -- the most comprehensive summary yet of research into the causes and effects of climate change. To read more, visit Effects of climate change tallied up.

Back to Top

---

Factors

Greenhouse Gases
The increase in greenhouse gases caused by human activity is often cited as one of the major causes of global warming. These greenhouse gases reabsorb heat reflected from the Earth's surface, thus trapping the heat in our atmosphere. This natural process is essential for life on Earth because it plays an important role in regulating the Earth's temperature. However, over the last several hundred years, humans have been artificially increasing the concentration of these gases, mainly carbon dioxide and methane in the Earth's atmosphere. These gases build up and prevent additional thermal radiation from leaving the Earth, thereby trapping excess heat.

Solar Variability & Global Warming

Some uncertainty remains about the role of natural variations in causing climate change. Solar variability certainly plays a minor role, but it looks like only a quarter of the recent variations can be attributed to the Sun. At most. During the initial discovery period of global warming, the magnitude of the influence of increased activity on the Sun was not well determined.

Solar irradiance changes have been measured reliably by satellites for only 30 years. These precise observations show changes of a few tenths of a percent that depend on the level of activity in the 11-year solar cycle. Changes over longer periods must be inferred from other sources. Estimates of earlier variations are important for calibrating the climate models. While a component of recent global warming may have been caused by the increased solar activity of the last solar cycle, that component was very small compared to the effects of additional greenhouse gases. According to a NASA Goddard Institute for Space Studies (GISS) press release, "...the solar increases do not have the ability to cause large global temperature increases...greenhouse gases are indeed playing the dominant role..." The effects of global warming are apparent (see section below) despite the fact that the Sun is once again less bright during the present solar minimum. Since the last solar minimum of 1996, the Sun's brightness has decreased by 0.02% at visible wavelengths, and 6% at extreme UV wavelengths, representing a 12-year low in solar irradiance, according to this NASA news article (April 1, 2009). Also, be sure to read this more recent article: 2009: Second Warmest Year on Record; End of Warmest Decade.

Why is global warming happening and causing so many problems in the environment?
*Dancer123*

Polar Bears= Global Warming

Some people may think that global warming doesn't exist then some may say that it does. I believe that it does because what else would you call the polar parts of the world to be melting, the sun!? No there has to be a word for that and that word is called Global warming. Global warming causes Earth's atmosphere to become weaker fast and fast over the years before you know it it will always be wicked warm. There are many ways that we can stop Global Warming, stop throwing trash around like we don't care, stop driving cars as much as we do now because of the bad natural gases going into the air, don't use as so much water and electricity when you don't need it, recycle plastic, and paper whenever you can, plant a tree once here or there, encourage people around you to stop polluting, try to make the greenhouse gases to not go into the atmosphere and out and into the air. There are so many ways that we can stop Global Warming and if we all do our little part the whole world can change and go back to the way it was before.Not polluted.

Global Warming Cartoon

Life on earth depends on energy from the sun. About 30 percent of the sunlight that beams toward Earth is deflected by the outer atmosphere and scattered back into space. The rest reaches the planet's surface and is reflected upward again as a type of slow-moving energy called infrared radiation.

This is information from Greenhouse Affect

The 12 days of global warming!!!!!!!!!!!!

Global warming map and what we can do about it

I think that global warming DOES exist!

Global warming does exist

• Polar bears slowly becoming extinct
• Pollution in the air
• Bad chemicals weakening our atmosphere
• More trash everywhere
• More warmth coming from the sun to us causing the Arctic and Antarctica to shrink.
• More resources to prove dancer143 wrong.
• Insects that are multiplying over the years and are eating our Earth
• Factories that let off bad natural gases
• Car gases
• Using too much electricity

• Earthquakes and other natural disasters that give off pollution in our ground.THESE ARE THE REASONS THAT GLOBAL WARMING EXIST!!!!!!

Global Warming, Does it Exits?

The video above shows does global warming exist its on both sides of me dancer143 debate against global warming
LET THE DEBATE GO ON!!!!!!!!!!!!!!!!!!