what is the main reasons of global warming?

Answer 1

Global warming has happened many, many times during the Earths history, it's a natural phenomena. However due to increased CO2 levels ejected into the atmosphere by us, the reduction of O2 producing trees etc and heat given of by cities and manufacturing, we have simply speeded up the process, it would have happened again anyway.
So the main reasons for global warming are Nature herself and the Human race.

Answer 2

Global Warming is caused by greenhouse gases, deteriorating the ozone, letting the sun's harmful rays into Earth's surface.
Are greenhouse gases bad? Absolutely not, we can't live without them. Environmentalists and the media portray global warming as a manmade event, and it's not. It's natural. In the past, we have had many glacial and interglacial periods, without human activity.

The main greenhouse gas, is actaually water vapor. We can't remove water vapor from the atmosphere, so scientists usually say CO2 is the main cause.

The effect itself is caused by canges in the sun's activity. If the sun intensifies, then it gives off more rays, which in turn, harm us. We don't even have enough data to prove that this is actaually happening, 40 years or so of data. Because global temperatures didn't stay the same, and rose, we say the earth is heating, and will continue to heat. If the temperatures fell, we would say there is going to be an ice age. We, as a population, are making too many assumptions.

Answer 3

So far, many people have answered either emotionally with no data or with wrong answers.

First, know that what you ask is not a simple question. Here's simple overview.

The earth's climates have fluctuated over the course of history. Right now, our best window into these changes are ice-core samples. What these samples contain are little bubbles of the atmosphere from when the ice was formed.

The layers (plus soil core layers and other data) give a rough picture of what the the environment was like at the time. Keep in mind that these data aren't monthly or daily. A layer may span a thousand years or more. So when I say rough, I mean rough.

So what do these data tell us. By correlating several pieces of data we can get a rough idea of when the earth was warmer and when the earth was colder.

The data that has been found shows that when the earth's atmosphere contained certain amounts of certain gases, the earth was warmer and vice versa. The one that gets all the press is CO2.

Why? CO2, like all "greenhouse" gases, absorb infra-red radiation (heat). In the right amounts, this is a good thing as it keeps the earth a pleasant temperature instead of reflecting all the heat off into space.

The problems begin when there is too much of it. As more and more of these gases are in the atmosphere, the more heat gets trapped instead of being radiated out into space. This has the effect of raising the earth's overall temeperature.

However, if you look at the past data you'd note that CO2 concetrations seem to slightly lag the warm periods. So how can CO2 be the cause of global warming.

The answer is that CO2 isn't the cause, at least, not in the past warm periods. Changes in the environment caused by volcanic eruptions, stronger solar output, mass extinctions, etc. could have triggered slight increases in global temperatures. If the temperatures raise enough, you have other events unfold. The ocean doesn't absorb as much. Tundras become massive swaps and release stored gases into the atmosphere. So on and so forth.

So now you have more greenhouse gases in the atmosphere, so even when the temperatures would return to normal you 've got more and more heat being trapped, which in turn releases more gases, and now your in a feedback loop.

Eventually, a critical point is reached and the environment begins to rebalance itself.

In short, global warming climate change has always been caused by some event which increases greenhouse gases in the atmosphere which gets the planet going into a warm spell.

So as you can see, gases like CO2 probably didn't cause global warming by themselves in the past, but acted more like a facilitator once things got going.

Fast forward to modern day. Anyone can see the the world is warming up. You can even go to NOAA and get the data yourself. However, there doesn't appear to be any global level event that's causing the warm up. NASA isn't reporting much if any increase in solar output. Volcanism is normal.

The one thing that has changed in the CO2 levels. They've increased from 280 ppm a few decades ago to 390 ppm now. That's a pretty big increase in such a short amount of time.

Right now, the data looks like a majority of the increase is due to anthropegnic sources, i.e. human industry. Not really surprising considering the huge amounts carbon based fuels we use everyday.

There have also been increases in other gases, but CO2 is currently the star of the show.

So at best, we are contributing to the problem. At worst, we are causing the problem. The jury is still out on that, but it's looking more and more like we are the cause.

Regardless of whether we are the cause or not, it doesn't change the fact that the planet is warming up. We still need to be prepared for what global changes this may cause. Even if there is nothing we can do to prevent it, we should at least be prepared for the consequences.

It's hard to sift through all the noise regarding this subject. There are people on both sides that are highly biased and are motivated more by belief (emotion) than fact. But the data is available for anyone to look at. NASA has even released a climate modeling program you can download to experiment with global warming factors.

In the end, you can't beat the laws of physics. More heat trapping gasses in the atmosphere means more heat is trapped. We will have to prepare one way or another.

~X~

Answer 4

I think your guess is WRONG . Let us look at the great CO2. Yes the world has burned a lot of fuel and that makes a lot of CO2. But go measure it where did it all go. Well our good friends the green plants need CO2 as much as we do oxygen. I have been measuring gas for years and I can find no increase in CO2.
What about methane and again I say go measure it. That is a little difficult as methane is lighter than air so it goes straight up. what test can we do then, we already have ,we fired mussels through it if it were there there would of been a big explosion. I believe in the upper atmosphere that the sun oxidize it and then it is CO2 and water vapor,and being very heavy it falls to the ground. Mother nature has been recycling for a few million years and done a great job.

Answer 5

Net global warming results from the absorption of infra red radiation by certain particals in the atmosphere. Water vapour actually has a higher global warming potential than carbon dioxide, in fact 95% of global warming is down to water vapour, but without it our planet would be about 20 degress centigrade colder, so it is necessary in order to sustain life. However, since water is necessary for just about everything, it's hardly ever included as a global warming topic.

Carbon dioxide only has a global warming potential of 1, as it is used as a standard, but since the industrial revolution, concentrations of carbon dioxide have risen by 130 parts per million (ppm), totalling it to about 380ppm. Industry appears to have caused this rise.

Cows produce methane, which also adds to global warming, with a potential of 21 (the higher the number, the more warming occurs. So 21 molecules of carbon dioxide would do the same amount of damage as one molecule of methane. When it gets to SF4, well that's got a potential of 23,900!). Cows contribute to 3% of the UK's greenhouse gas emmission every year. But unless we all take a sudden dislike to beef, we can't do anything about it.

The main problem with rising carbon dioxide levels is that, although it doesn't look as though its rising by much, it will get to a point where trees, believed to be a carbon sink so long as they don't die or burn, undergo photosynthesis, which is a highly inefficient process. If there is more carbon dioxide in the air than light being processed, the carbon dioxide will not be used, it will stay in the air and it will get warmer. As it gets warmer, the trees respire more, producing more carbon dioxide. Also, higher temperatures mean more forest fires, which will mean a rapid release of carbon dioxide. After that, it all begins to spiral out of control. Ocean acidity increases because oceans absorb carbon dioxide, which will kill mass amounts of creatures as well as alter currents and in particular a certain drift that keeps Britain warm. So we're all going to freeze to death if this drift is messed with. Polar ice caps will melt, therefore sea levels will rise, so goodbye London. And there will be even worse weather events. Remember New Orleans? Remember the devastation it caused? You can expect to see that as a much more frequent occurrence.

So what do we have to blame? Increasing industry, cows, burning of fossil fuels and certain people who refuse to admit that global warming is going to happen, is happening, and will continue to happen. It is mainly these people, namely the Australian's, American's and part of Canada, who have refused to sign the Kyoto protocol, who are ruining it for everyone. Because if the rest of the world does something about carbon dioxide levels and greenhouse gases but these countries don't, it's not going to have much effect. It's a global problem, not something that can be solved just by saying, we won't burn fossil fuels, because you can bet someone else will, and they'll burn even more of them because there will be more available to them on the grounds that no one else is buying them.

This obviously isn't everything. There are whole huge reports about this, and I could eaily write one, but I've already written loads. I've missed out loads of important stuff too but I think that's enough for now. Although, with reference to JOHNNIE B, mother nature has been doing a wonderful job, but that's only because we have carbon sinks, and the fact that carbon dioxide levels are rising, (IT'S A FACT,) suggests that mother nature is struggling and may give up entirely within the next hundred years or so.

Answer 6

Global warming is largely the result of emissions of carbon dioxide and other greenhouse gases from human activities including industrial processes, fossil fuel combustion, and changes in land use, such as deforestation.

Answer 7

- Large emission of CO2 from industries and machines.
- Cattle ranching which contributes to methane.
- Many more.

Answer 8

Al Gore.

Answer 9

CAPITALISM AND CORPORATION
i hate america, cant wait to get outta here
here some more
http://climate.weather.com/?ref=b10d8ef93e5db167b83edcaab2ae5d768f9e57af

Answer 10

First of all are use of fossil fuels. Methane gas is second and massive solar eruptions third.