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re: Coldest days ahead in years....
Posted on 1/6/14 at 2:18 pm to BeefDawg
Posted on 1/6/14 at 2:18 pm to BeefDawg
quote:
Carbon dioxide has unique long-term effects on climate change that are largely "irreversible" for one thousand years after emissions stop (zero further emissions) even though carbon dioxide tends toward equilibrium with the ocean on a scale of 100 years. The greenhouse gases methane and nitrous oxide do not persist over time in the same way as carbon dioxide. Even if human carbon dioxide emissions were to completely cease, atmospheric temperatures are not expected to decrease significantly in the short term.
Even the smallest increases have large effects.
Posted on 1/6/14 at 3:05 pm to greygatch
quote:
Even the smallest increases have large effects.
Check the diagram on page 3 of this: LINK
250 years ago, before humans even began contributing to CO2 concentrations, the atmosphere was at about 280 ppmv.
500 million years ago, the Earth's atmosphere had OVER 7,000 ppmv of CO2, and yet the Earth fell into a 5 million year long ice age.
430 million years ago, the atmosphere had almost 5,000 ppmv of CO2 concentration, and yet it fell into a nearly 10 million year ice age.
Between 330 million and 270 million years ago, the atmosphere had around 500 to 700 ppmv of CO2, and we had 60 million year long ice age that blanketed the entire Earth (snowball effect).
Today, we have 400 ppmv of CO2. And in the 250 years of human contribution to CO2, it's only gone up 120 points from 280 to 400. And that includes natural causes, which account for nearly half. So humans have caused an increase of 70 ppmv in CO2 concentration in our entire contributing existence.
70 ppmv. Even though we had ice ages when the Earth had over 7,000 ppmv, and you're concerned about the 70 we've added in 250 years?
Come on, get real.
This post was edited on 1/6/14 at 3:07 pm
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