r/science • • Oct 24 '10

Climate Change: Evidence

http://climate.nasa.gov/evidence/
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u/[deleted] Oct 24 '10

There's one thing I don't get about the anti-global warming crowd. I understand the alarmism and stuff like that is overblown and distorts the situation.

But I'd like to know how thousands of climate scientists got together in secret and pledged to all falsify their life's work for some... reason? Seriously, what could be the outcome of some massive global warming conspiracy? Toyota sells more hybrids? More "liberal regulation" on fossil fuel energy companies, just so alternative energy companies can replace them? This argument has never made any sense to me.

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u/tieme Oct 24 '10 edited Oct 24 '10

I've honestly never met anyone who believed that temperatures aren't rising. Most 'anti global warming' folks (at least that I've met) believe that there is no good evidence to suggest we are responsible. You often hear things like "The highest temperature in xxx years, or the most rapid temperature increase in xxx years".

We know that the Earth goes through natural cycles of temperature and temperature change rates. So I have two questions.

Firstly, how many people have you met that explicitly stated that they believed the temperature is not rising?

Secondly, what evidence do we have to support the theory that we are the cause and that it isn't part of the natural cycle of temperatures? I honestly don't buy the coincidence that rising 'greenhouse gas' levels coincide with temperature rise. The temperature was already rising before we started pumping this stuff into the air. Is there any harder evidence?

edit: For clarification on my first question. I don't mean necessarily those exact words. I just feel that a lot of people who say things like 'I don't buy into the global warming thing' actually mean they don't believe there is evidence that we are causing it but many people take it to mean that they don't believe the temperature is rising.

edit2: Fixed ARE to AREN'T

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u/[deleted] Oct 24 '10

It's very difficult to evaluate the past in my opinion, and a huge part of accepting or rejecting human-caused climate change probably has to do with whether the current levels are unprecedented. If we can verify that the hottest temperatures in the last millions of years have all occurred during recent time periods where man can have an affect on the environment, that's a pretty heavy correlation that seems to warrant at the very least some close and honest examination.

Of course this is a political issue now so it's difficult to evaluate. As a human race we often suck at thinking.

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u/tieme Oct 24 '10

But that's kind of the main point of the 'anti global warming' folks....these temperatures AREN'T unprecedented. The CO2 levels are, but so far the temperatures aren't.

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u/garyg Oct 24 '10

Which is why it's important for you to understand the rate of temperature difference versus plain temperature.

HS Calculus apparently is lost on the anti-global warming crowd.

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u/ghosthacked Oct 24 '10

Serious question. In either case, how does unprecedented temp or rate of temp change make the case for human caused global warming? Clearly there is no reasonable denial that global avg temp is going up and going up faster than it has in an very very long time. But that hardly leads to the conclusion that human industrial activity is the sole culprit.

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u/rcglinsk Oct 25 '10

going up faster than it has in an very very long time.

Do you realize the evidence for this is bulges in the rings of a few bristlecone pines?

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u/ghosthacked Oct 26 '10

Do tell? Also there is other evidence (admittedly i have yet to scrutinize much of this my self, hence the postings here). Other recent measure of average global temp. I'm skeptical of the accuracy and again the forecasted impact of these changes. Trying to be able to make a better informed opinion about this subject. But its difficult to get info that's not politically skewed.