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Humanity Responsible For Current Climate Change
tehanu writes "Scientists working with Antarctic ice have found that the level of greenhouse gases is at the highest level in over half a million years. Carbon dioxide is 27% higher now than any other time over the last 650 000 years. Methane, an even stronger greenhouse gas is 130% higher. The period of time studied covers eight full glacial cycles including a time when the earth's position relative to the sun is the same as it is today. Other scientists have found that the annual rate at which the sea has risen since the industrial revolution is twice that of over the last 5000 years. It is predicted that by 2100 the sea level will be 40cm higher. These results provide strong evidence that human activity since the industrial revolution, rather than just natural processes, has strongly altered the world's climate. As one of the scientists involved in the research put it: 'The levels of primary greenhouse gases such as methane, carbon dioxide and nitrous oxide are up dramatically since the Industrial Revolution, at a speed and magnitude that the Earth has not seen in hundreds of thousands of years.'"
I lived in Germany for 3.5 years (you can probably guess why). And when I was there, gas was about what you quoted, except at the time is was in Deutschmarks- but it was about the same price. And that was 15 years ago.
And when gas is that expensive...people FIND other ways to get around. You do it by necessity.
American's won't change until this happens.
No reason to lie.
I was discussing the global warming issue just last Tuesday with someone who was very adamant that humans are responsible for everything.
Are humans responsible for everything when it comes to Global Warming or the greenhouse effect? Of course not, don't be silly. And nobody who actually has a clue but is concerned about the issue claims that. The claim is that humans are responsible for a significant deviation in the expected natural lavels of global warming via the greenhouse effect.
As I offered more and more opposing evidence suggesting that there is no definitive proof that mankind is responsible
There isn't any "definitive proof" that humans are responsible for significant deviations in factors affecting global climate. Just like there isn't any "definitive proof" that evolution is correct, or that dark matter exists. What there is, is a weight of evidence toward the degree of impact of human factors that puts the burden of proof pretty squarely on those claiming humans are not responsible.
What do we know? We know that in the past 200 years humans have produced large volumes of carbon dioxide and methane through various industrial processes. We now know that current levels of carbon dioxide and methane are the highest they've been for over 650,000 years. We know that global temperature correlates extremely closely with atmospheric carbon dioxide levels over a range of 650,000 years. We know that atmospheric carbon dioxide traps heat, and can cause global warming. We know that there has been an acceleration in the rate or rise of global temperatures (beyond what would be expected coming out of the "little ice age" 400 years ago) that is apparently unprecendented for the last 2000 years or so.
Are humans solely responsible for the current warming trend? No, we're coming out of small dip in global climate, so there was some warming anyway. You'll also find that solar variation accounts for around 30% or the observed warming (or at least that's what the IPCC reports claim), and other natural cycles are responsible for some as well. The fact remains that humans have produced a lot of carbon dioxide and methane in the last 200 years, that those gases do cause warming, and that the levels of those gases are unprecendented to the last 650,000 years. Humans are providing a significant forcing compared to natural fluctuations, it would be surprising if that didn't have an impact.
Jedidiah.
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Your calculations show that 0.01% of the atmosphere is CO2. Hence you argue, it is impossible for a 27% increase in the CO2 levels to affect anything. 0.004% of the human body is iron. So the percentage of CO2 in the atmosphere is 250 times the percentage of iron in the human body. http://www.britannica.com/ebi/article-202929 Using your reasoning, I guess iron has absolutely no effect on the human body and is just there as filler eh? 20grams is 0.03% of the weight of a 60kg man. Yet, the lethal human dose for arsenic is 20g. http://en.wikipedia.org/wiki/Arsenic 50mg is 0.000083% the weight of a 60kg man. Yet, the lethal human dose for hydrogen cyanide is 50mg. If it is inhaled, concentrations of 300 parts per million is all that is needed. http://en.wikipedia.org/wiki/Cyanide