OK. I'll give you a short introduction to the topic and then quote some climate scientists.
The Sun heats the Earth and the Earth ordinarily radiates enough of this heat energy back into outer space to stay in thermal equilibrium. Direct measurements show that the level of CO2 in the Earth's atmosphere has increased by over 40% in the last 150 years. Isotopic analysis shows that the extra CO2 is coming from the burning of fossil fuels. The laws of physics and numerous scientific studies and experiments have shown that CO2 is a powerful greenhouse gas that has the quality of absorbing and re-radiating the infrared radiation coming from the Earth's surface, thus keeping more of the sun's energy trapped in the Earth's atmosphere rather than being radiated away into space.
"One way of measuring the effect of CO2 is by using satellites to compare how much energy is arriving from the sun, and how much is leaving the Earth. What scientists have seen over the last few decades is a gradual decrease in the amount of energy being re-radiated back into space. In the same period, the amount of energy arriving from the sun has not changed very much at all. This is the first piece of evidence: more energy is remaining in the atmosphere. The final piece of evidence is ‘the smoking gun’, the proof that CO2 is causing the increases in temperature. CO2 traps energy at very specific wavelengths, while other greenhouse gases trap different wavelengths. In physics, these wavelengths can be measured using a technique called spectroscopy. Here’s an example:
The graph shows different wavelengths of energy, measured at the EarthÂ’s surface. Among the spikes you can see energy being radiated back to Earth by ozone (O3), methane (CH4), and nitrous oxide (N20). But the spike for CO2 on the left dwarfs all the other greenhouse gases, and tells us something very important: most of the energy being trapped in the atmosphere corresponds exactly to the wavelength of energy captured by CO2. The investigation by science builds up empirical evidence that proves, step by step, that man-made carbon dioxide is causing the Earth to warm up."
Source -
Empirical evidence that humans are causing global warming
Bravo. What a show... Except for the mental midget conclusion about about CO2 "dwarfing" everything else..
Common knowledge pal that methane (pound for pound) and MANY of those compounds in your chart EXCEED the "warming power" of CO2 by orders of magnitude. So there is more to the story.. In fact water vapor is 60% of the radiative energy of Greenhouse and methane is 20 to 30 times MORE POWERFUL as CO2. You expect crappy science from skepticalscience.com every time.
LOL.... talk about "
mental midgets", you really take the prize, fecalhead.....no, you poor imbecile, we expect crappy science from
you every time. And lies and deliberate deceptions, of course.
Other than water vapor, which is a separate story, CO2 does, in fact, dwarf the effects of the other greenhouse gases because there is so much more of it in the atmosphere. A fact that you're either deliberately ignoring in your futile duplicitous attempts to deny reality, or that you just too dumb-butt ignorant to comprehend. Probably the former, since you mention that water vapor accounts for 60% of the greenhouse effect but, instead of telling us the percentage that methane accounts for, you just say that "
methane (pound for pound)" is 30 times more powerful than CO2. Misleading by omission is still lying, fecalhead.
Carbon dioxide levels are currently a little over 400 parts per million while methane levels have risen (from 700ppb pre-industrial, also because of mankind's activities, BTW) to a current level of about 1800 parts per
billion, or only 1.8 parts per million, and nitrous oxide is 324 parts per
billion, or only .3 parts per million. Methane is indeed 30 or more times more powerful a greenhouse gas than CO2 but there is well over 200 times more CO2 in the atmosphere than methane, which is why the effect of CO2 does, in fact, dwarf the effects of methane, currently. Of course, if AGW warms the oceans enough to destabilize the methane clathrate deposits, that might change. The increased radiative forcing of current CO2 levels, in Watts per square meter (W/m2), is 1.85 while all of the methane in the atmosphere is only 0.51. (
source)
As far as water vapor goes, it is clear to scientists that it is a feedback and not a forcing. Something that you are undoubtedly too dimwitted or brainwashed to comprehend.
Denier argument - Water vapor is the most powerful greenhouse gas
When skeptics use this argument, they are trying to imply that an increase in CO2 isn't a major problem. If CO2 isn't as powerful as water vapor, which there's already a lot of, adding a little more CO2 couldn't be that bad, right? What this argument misses is the fact that water vapor creates what scientists call a 'positive feedback loop' in the atmosphere — making any temperature changes larger than they would be otherwise. How does this work? The amount of water vapor in the atmosphere exists in direct relation to the temperature. If you increase the temperature, more water evaporates and becomes vapor, and vice versa. So when something else causes a temperature increase (such as extra CO2 from fossil fuels), more water evaporates. Then, since water vapor is a greenhouse gas, this additional water vapor causes the temperature to go up even further—a positive feedback.
How much does water vapor amplify CO2 warming? Studies show that water vapor feedback roughly doubles the amount of warming caused by CO2. So if there is a 1°C change caused by CO2, the water vapor will cause the temperature to go up another 1°C. When other feedback loops are included, the total warming from a potential 1°C change caused by CO2 is, in reality, as much as 3°C. The other factor to consider is that water is evaporated from the land and sea and falls as rain or snow all the time. Thus the amount held in the atmosphere as water vapour varies greatly in just hours and days as result of the prevailing weather in any location. So even though water vapour is the greatest greenhouse gas, it is relatively short-lived. On the other hand, CO2 is removed from the air by natural geological-scale processes and these take a long time to work. Consequently CO2 stays in our atmosphere for years and even centuries. A small additional amount has a much more long-term effect. So skeptics are right in saying that water vapor is the dominant greenhouse gas. What they don't mention is that the water vapor feedback loop actually makes temperature changes caused by CO2 even bigger.