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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Winfastorlose who wrote (1145322)	6/29/2019 1:12:57 PM
From: Wharf Rat	Respond to of 1578303

"Atmospheric content finds Carbon at 400 parts per million" Close enuf for government work co2.earth "Ar 150 parts per million all plant life would die here on earth." So, if 400 is too high, and 150 is too low, maybe we should find a way to get back to something in between. == "It's truly amazing that the propaganda specialists have been able to create a generation of total illiterates." You are, aren't you? I'm glad I pre-dated the merchants of doubt. Here's water vapor. Believe it or not, others thought about it before you did. I even had to think about the water vapor in the lungs. That was in the early '70's, and it's a tale for another day. Water Vapour as a positive feedback As water vapour is directly related to temperature, it's also a positive feedback - in fact, the largest positive feedback in the climate system ( Soden 2005). As temperature rises, evaporation increases and more water vapour accumulates in the atmosphere. As a greenhouse gas, the water absorbs more heat, further warming the air and causing more evaporation. When CO2 is added to the atmosphere, as a greenhouse gas it has a warming effect. This causes more water to evaporate and warm the air to a higher, stabilized level. So the warming from CO2 has an amplified effect. How much does water vapour amplify CO2 warming? Without any feedbacks, a doubling of CO2 would warm the globe around 1°C. Taken on its own, water vapour feedback roughly doubles the amount of CO2 warming. When other feedbacks are included (eg - loss of albedo due to melting ice), the total warming from a doubling of CO2 is around 3°C ( Held 2000). skepticalscience.com