What is global warming?

Please explain global warming.

Answer:
The short, global climate change (global warming) is real. I want to explain below the difference between "natural processes" and "human influence" to give you a better picture of why global warming is so important. Here's my long version below:

Over the geologic timescale, the Earth has gone through natural variations in the amount of carbon dioxide. The long-term inorganic carbon-silicate weathering cycle accounts for these discrepancies. First, carbon dioxide is dissolved in rainwater which reacts to form carbonic acid. From there, the rainwater falls on land or ocean. On land, carbonic acid reacts with rocks and combines to form a bicarbonate ion through the process of weathering. These weathered carbonate materials are then carried to the ocean and form minerals on the ocean floor. The rocks that form the ocean floor are gradually carried toward the continental boundaries by plate tectonics, where the carbonate rock is subducted under the continental crust. The rock is then heated as it descends into the mantle, releasing the carbon dioxide and allowing it to escape and return to the atmosphere through volcanic eruptions. This ongoing cycle regulates the carbon dioxide content of the Earth’s atmosphere and acts as a thermostat to keep the Earth’s climate fairly stable. The cycle also ensures that most of the Earth’s carbon dioxide resides in carbonate minerals on the ocean floor rather than in the atmosphere as carbon dioxide gas.

This natural process on Earth has been a large factor to keep the planet’s climate conducive to life. The carbon-silicate weathering cycle is a “negative feedback” process. Although the word “negative” has an ominous connotation, it actually describes a feedback loop which allows the temperature of Earth to remain fairly constant over time. For example, there was a period known as “Snowball Earth” where the Earth was completely frozen. When the Earth was frozen, weathering of rocks ceased to exist because it was too cold for precipitation, the beginning of the weathering process. Because there was no weathering, carbon dioxide was not taken out of the air and placed into rocks. This led to a build-up of carbon dioxide in the Earth’s atmosphere. The increased carbon dioxide triggered a stronger greenhouse effect that caused the Earth to warm bringing it out of the Snowball Earth period.

The last paragraph described Earth’s feedback mechanism to manage natural sources of carbon dioxide over geologic time. However, carbon dioxide input in the past century has increased rapidly due to anthropogenic sources. Global Warming or Global Climate Change postulates that a net increase in greenhouse gases will lead to increased warming of the planet. This theory is based on observations from ice core records and forecasted trends from global climate models. Global mean surface temperatures have increased 0.5-1.0°F since the late 19th century from the beginning of the Industrial Revolution. Also, the 20th century's 10 warmest years all occurred in the last 15 years of the century. Of these, 1998 was the warmest year on record. Records at Mauna Loa, Hawaii have kept these records since 1960, prior to that year; ice core data has shown the same increase in carbon dioxide.

How can we know how much global warming will impact the Earth? Well, the computer models are getting better but there is still a lot of uncertainty. However, models that I have worked with have shown the temperature increase becoming much more significant over the next 10-30 years.
Global warming is the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation.
the world gets warmer due to polution
Go rent "An Inconvenient Truth" - the documentary narrated by Al Gore. You'll get a great lesson on Global Warming. Or check out one of these websites:
http://www.climatecrisis.net/
http://www.nrdc.org/globalwarming/...
Some gases ("greenhouse gases") let sunlight in, which warms the Earth, and then block that heat from leaving. That's the "greenhouse effect", and it's a natural thing, mostly caused by water vapor.

Man is making excessive amounts of greenhouse gases, mostly by burning fossil fuels. That causes the delicate natural balance to go out of whack and the Earth warms. That's global warming.

It won't be a Hollywood style disaster. Gradually coastal areas will flood and agriculture will be damaged. But it will be very bad. Rich countries will cope, but it will take huge amounts of money. In poor countries many people will die of starvation, but not all of them.

Most scientists say, in 20-50 years. But we need to start right now to fix it, fixing it will take even longer than that.

More information here:

http://profend.com/global-warming/...

Lots of numerical scientific data proving it real here:

http://en.wikipedia.org/wiki/image:clima...

http://www.ipcc.ch/spm2feb07.pdf...
Global Warming is the Earth getting warmer due to gas and pollution. The Earth isn't warming up to fast though but if The Earth keeps polluting like it is, who knows.
The ice-core data is frequently cited as principal evidence to argue that CO2 is the earth’s main climate driver. Rises in the CO2 level "closely corellate" to rises in temperature. It is the jewel in the crown of the theory of man made global warming. But the ice-core data does not show that CO2 drives climate. It shows, very clearly, that the opposite is true!! Variations in temperature precede rises in atmospheric CO2 by several hundred years. It's true they correllate, but with an inverse relationship to that inferred by the Global Warming quacks.

Talk about an inconvenient truth.

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