Climate Change due to Global Warming – a hoax?

[icareforyou]

Conclusion to the Thread is very well brought out. Thanks Bored Wombat.


"Even if temperature had risen above natural variability, the recent solar Grand Maximum may have been chiefly responsible. Even if the sun were not chiefly to blame for the past half-century’s warming, the IPCC has not demonstrated that, since CO2 occupies only one-ten-thousandth part more of the atmosphere that it did in 1750, it has contributed more than a small fraction of the warming." (+ much more)


FIRST OPINION

[Bored Wombat]

Originally Posted by icareforyou

Conclusion to the Thread is very well brought out. Thanks Bored Wombat.

Thank you.

However, I can't agree with this:

Originally Posted by icareforyou

"Even if temperature had risen above natural variability, the recent solar Grand Maximum may have been chiefly responsible. Even if the sun were not chiefly to blame for the past half-century’s warming, the IPCC has not demonstrated that, since CO2 occupies only one-ten-thousandth part more of the atmosphere that it did in 1750, it has contributed more than a small fraction of the warming."

Temperature has risen above natural variability, and the influence of changes in solar irradiance is about 1/10 of that of the anthropogenic greenhouse effect:



The sun is certainly not to blame for the past half-century's warming, for this reason, and other evidence:

1) The sun would warm the upper atmosphere as well as the troposphere. Measurements show that the stratosphere has cooled.

2) The sun would warm the summer and the day more, because that's when the sun is out. Measurements show that the night and winter have warmed more.

CO2 has increased from 280ppm to over 380ppm. This is indeed an increase of one part per ten thousand, but it is a 35% increase in CO2 concentration. The IPCC has shown that this is the most significant driver of recent climate change. (as per the radiative forcing chart above).