What is global warming ?

Question

how it happen and why?

Answer 1

Global warming is the result of atmospheric gases creating a "greenhouse" around the earth. These gases create a situation where ultraviolet radiation can come in but cannot leave this invisible barrier around the earth. This creates an overall warming effect.

Answer 2

Global warming is the concept that the Earth is heating up. There is some debate about what is actually happening, whether the earth is really getting warmer, whether any effects are just regional climate change, and the possibility that we may be getting ready to enter an ice age. The truth is, that no one knows for sure what is going on. Global warming can be a natural phenomena, and we have evidence of it happening many times in the past. I will say that as a geologist and environmental consultant, I agree that we need to practice conservation and responsible use of resources, regardless of my views on global warming.

Answer 3

It is very much like a car left in the hot sun. Have you ever just gotten into a car on a hot summer's day after it has been parked in the sun for a while? It is hotter inside the car than outside. The reason for this is that high energy light from the sun (the kind you can't see) gets into the car easy enough, but in doing so loses some of its energy. Then it bounces around the inside of your car but does not have enough energy to pass through the windshield again. So it is stuck inside the car now. This adds heat to the interior of the car and make it hot.

It is the same idea with global warming. The light has enough energy to get inside the atmosphere of the earth, but after bouncing around and losing energy from its journey into the atmosphere, it does not have enough energy to get back out again. The 'greenhouse gases' are gases that increase the amount of energy it would take for a photon to leave the atmosphere. In effect, these gases bounce light back to the earth when otherwise the light would have left earth. Bouncing this light back to earth increases heat, making things warmer.

If you'd like to know what it would be like if this process gets worse, take a look at information on Venus. Venus's atmosphere has created a 'runaway greenhouse effect' for the planet. It is very hot there, not because it's closer to the sun, but because there are alot of greenhouse gases that trap heat.

Humans add greenhouse gases to the atmosphere. This accelerates the effect of global warming. So while global warming may be a natural phenomenon (and probably would occur without human intervention), humans do have a huge effect on their surroundings and, in this case, have made the warming occur at an increased rate.
Hope this helps.

Answer 4

All of this CO2 stuff is a bunch of nonsense, in that no one knows how much it contributes to the warming of the Earth. I'm sure it does, but there is not one expert who can verify this.

What global warming is, is a naturally occuring event that comes and goes, over the eons, in direct relation to the amount of solar activity. The Earth has been in a warming trend for around 150 years and the cessation of all human activity would not prevent the Earth from warming into the unforeseeable future. It is a misnomer. All suggested measures to curb it, such at less fossil fuel emissions, recycling, etc are good for our planet and good for us, but will have little or no effect on the over-all temperature of the Earth.
I suggest you start your research into this by studying the Little Ice Age, which ended in the middle of the 19th Century. Wikipedia is a good place to start, but don't stop there. You will begin to see the reality of all of the hype being built-up around this politically correct issue.

Answer 5

In order to understand global warming one has to understand why the Earth entered an extremely unusual occurrence of global cooling. I am speaking of glaciation during the Pleistocene. The answer to this question is that geo-scientists have several ideas, but none of them has been accepted. Until this question is resolved no one can answer why the Earth has undergone global warming for the last 11,000 years. Are we in an interstitial glacial period with more glaciation to follow? Have we exited glaciation completely and the Earth is going to its natural temperature, which is hotter than it is today? The answer has not been resolved because we don't know enough about what caused global cooling in the first place.

Answer 6

literally, global warming is the warming of the earth on a global scale. it destroys our ozone layer which protects from the harsh UV rays coming from the sun but it does trap heat on the earth. global warming also known as the green house effect, is a natural process on the earth since carbon dioxide is naturally produced by plants etc in nature. it is just accelerated due to the industrial revolutuon. by the year 2017, the protective layer of ozone is expected to decrease by 3% since there is high level of pollution by many countires esp in the US. global warming cannot be stopped but reduced.

global warming is also called the greenhouse effect bcoz;
when heat penetrates or enters through the glass of a greenhouse to the plants in it, it warms the atmosphere inside it. also with the plants inside it and the glass acting as a shield, heat and carbon dioxide is released into the atmosphere inside the house and is trapped there as well. thus since the gases or heat are not fully able to go back out of the house, the entire greeenhouse atmosphere heats up or 'warms'.
this is what happens to earth: the 'glass' in the greenhouse acts as our ozone layer which allows radiation to come to earth harmlessly but doesnt fully allow it to go back out in space as we would like it to. so the earth keeps getting warmer along with all the other gases being produced on it

Answer 7

The cause of global warming. If it is true and if it is because of CO2 increase, then it is due primarily to burning fuels above 30,000 ft. It has been shown that adding CO2 to a greenhouse will make the plants grow faster. This makes sense since CO2 is taken up by plants rapidly as its food. The high CO2 levels could not be maintained because of the plants rapid usage of the CO2. Also, CO2 is heavier than air. As theater productions use dry ice(frozen CO2) to cause a ground fog, this demonstrates that CO2 is heavier than air. JET ENGINES burn 2-5 tons of kerosene per hour. Thousands of hours of jet plane traffic is occurring each day above 30,000 ft. Each ton of fuel burned produces 3.66 tons of CO2. The good news is that the CO2 will slowly drift down to earth where it will be immediately used by plants!!! While the CO2 stays in the upper atmosphere, it presumably reflects heat back to earth as the above answers explain.

Answer 8

global warming is due to the increase in CFC (chloro fluro carbons) & HCFC (hydro chloro fluro carbons) which are released my mostly refrigerators, heavy machionaries etc. These deplect the ozone layer. Ozone layer is responsible to block the UV rays from the sun, if it s lost the earth receives most of the Heat that causes the increase in temperature, that is nothing but global warming

Answer 9

Global warming is the observed increase in the average temperature of the Earth's atmosphere and oceans in recent decades. The Earth's average near-surface atmospheric temperature rose 0.6 ± 0.2 °Celsius (1.1 ± 0.4 °Fahrenheit) in the 20th century [1].

The current scientific consensus is that "most of the observed warming over the last 50 years is likely to have been attributable to human activities"[2].

The primary causes of the human-induced component of warming are the increased amounts of carbon dioxide (CO2) and other greenhouse gases (GHGs)[3]. They are released by the burning of fossil fuels, land clearing and agriculture, etc. and lead to an increase in the greenhouse effect. This effect was first described by Joseph Fourier in 1824, and first investigated quantitatively in 1896 by the Swedish chemist Svante Arrhenius[4], although the greenhouse effect did not enter into popular awareness until the 1980s.

Climate sensitivity is a measure of the equilibrium response to increased GHGs, and other anthropogenic and natural climate forcings. It is found by observational [5] and model studies. This sensitivity is usually expressed in terms of the temperature response expected from a doubling of CO2 in the atmosphere, which, according to the 2001 IPCC report, is estimated to be between 1.5 and 4.5 °C (2.7–8.1 °F) (with a statistical likelihood of 66-90%)[6]. This should not be confused with the expected temperature change by a given date, which also includes a dependence on the future GHG emissions and a delayed response due to thermal lag, principally from the oceans. Models referenced by the Intergovernmental Panel on Climate Change (IPCC), using a range of SRES scenarios, project that global temperatures will increase between 1.4 and 5.8 °C (2.5 to 10.5 °F) between 1990 and 2100.

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. These changes may increase the frequency and intensity of extreme weather events, such as floods, droughts, heat waves, hurricanes, and tornados. Other consequences include higher or lower agricultural yields, glacial retreat, reduced summer stream flows, species extinctions and increases in the ranges of disease vectors. Warming is expected to affect the number and magnitude of these events; however, it is difficult to connect particular events to global warming. Although most studies focus on the period up to 2100, warming (and sea level rise due to thermal expansion) is expected to continue past then, since CO2 has an estimated atmospheric lifetime of 50 to 200 years. [7]. Only a small minority of climate scientists discount the role that humanity's actions have played in recent warming. However, the uncertainty is more significant regarding how much climate change should be expected in the future, and there is a hotly contested political and public debate over implementation of policies that deal with predicted consequences, what, if anything, should be done to reduce or reverse future warming, and how to deal with the predicted consequences.

You could get more information from the link below...

Answer 10

When we think about global warming the first thing that popo on ur mind its temperature raising, bUT THIS IS NOT ENTIRELI TRUE... hAVE YOU NOTICE SNOW IN PLACES THAT IS MOSTLY WARM. LIKE IN pUERTO RICO AND tEXAS? YES THATS RIGHT GLOBAL WARMING CAUSE TEMPERATURES TO CHANGE, NOT ONLY TO COLD BUT TO HOT TOO. tHE ICE CAPS MELTIN MAKING THE OCEAN LEVELS RAISE, CURRENST CHANGING, WATCH THE DAY AFTER TOMORROW FOR CRYING OUT LOUD. ITS CRAZY