goldkam wrote on Mar 9
th, 2018 at 5:49pm:
1. 2010 Anderegg study found that 97-98% of climate researchers publishing most actively in their field agree that human activity is primarily responsible for global climate change and global warming
So what did they say was the causal mechanism?
goldkam wrote on Mar 9
th, 2018 at 5:49pm:
2. Since 1751 about 337 billion metric tons of CO2 have been released into the atmosphere from the burning of fossil fuels and cement production, increasing atmospheric CO2 from the pre-industrial level of about 280 ppm (parts per million), to a high of 400 ppm in 2013. Methane, which is increasing in the atmosphere due to agriculture and fossil fuel production, traps 84 times as much heat as CO2 for the first 20 years it is in the atmosphere, and is responsible for about one-fifth of global warming since 1750. Nitrous oxide, primarily released through agricultural practices, traps 300 times as much heat as CO2.
So what was the historic level of CO2 during the Holocene Optimum, which was arguably warmer than today? How did they determine that? With the scales used it just wouldn't be there, except if it lasted more than 50,000 years.
methane - never affected life in the Holocene maximum. Why should it be scary this time? I have heard it's 20 times worse.
Nitrous Oxide - 325ppb? That is not scary. 3/5 of 5/8 of FA.
goldkam wrote on Mar 9
th, 2018 at 5:49pm:
3. Research by NASA has found over the past 650,000 years, atmospheric CO2 levels did not rise above 300 ppm until the mid-20th century.
Now that would be citing ice cores which have data problems. Although spotty, plant stomata suggest that is incorrect.
goldkam wrote on Mar 9
th, 2018 at 5:49pm:
4. CO2 produced by burning fossil fuels such as oil and coal can be differentiated in the atmosphere from natural CO2 due to its specific isotopic ratio. [101] According to the Intergovernmental Panel on Climate Change (IPCC), 20th century measurements of CO2 isotope ratios in the atmosphere confirm that rising CO2 levels are the result of human activity, not natural processes such as ocean outgassing, volcanic activity, or release from other "carbon sinks."
Once this anthropogenic CO2 is absorbed by the carbon sinks and then re-emitted can they differentiate between the carbon sinks CO2 and anthro CO2?
goldkam wrote on Mar 9
th, 2018 at 5:49pm:
5. From 1953–2006, Arctic sea ice declined 7.8% per decade. Between 1979 and 2006, the decline was 9.1% each decade. As of 2014, Arctic sea ice was being lost at a rate of 13.3% per decade. No other conclusions can be drawn other than global warming
" The first confirmed complete passage, from west to east, was made by the Finnish-Swedish explorer Adolf Erik Nordenskiöld, in 1878."
WIki or you can search Encyclopedia Britannica.
So it seems we have had global warming in the past.
1979 was a high for Arctic ice.
goldkam wrote on Mar 9
th, 2018 at 5:49pm:
6. A 2006 study found that "significant acceleration" of sea-level rise occurred from 1870 to 2004. Between 1961 and 2003 global sea levels rose 8 inches
Do
n't you think coming out of the LIA sea levels should NOT have increased?
"Seas around the world have risen an average of nearly 3 inches since 1992,
with some locations rising more than 9 inches due to natural variation, according to the latest satellite measurements from NASA and its partners."
https://www.nasa.gov/goddard/risingseasSo how much is natural variation and how much AGW?
With satellite altimeter accuracy between 34mm and 42mm. how do they get that?
How long have they had GPS on tide gauges to see which tide gauges are subject to subsidence?