by dissident » Sat 19 Nov 2016, 09:24:08
$this->bbcode_second_pass_quote('sjn', 'A')ny ideas how they actually measure CO2 emissions ? Do they just subtract known direct non-anthrogenic sources from the global total from satellite sensors? Or is it the output from a model of industrial/economic consumption patterns and efficiency gains? I ask because actual atmospheric CO2 has risen at the highest historical rate (accounting for seasonal variation) during the "stall".
One can calculate the emissions based on the annual increase in CO2 concentrations. It is a well mixed gas so the total amount in the atmosphere is not really hard to determine. The variability of the sinks is slow as well. It is not feasible to measure emissions directly since every chimney stack, biomass burning event, and vehicle needs to be tracked. Of course a detailed estimate of the emissions would require some sort of model for the distribution of CO2 and its sinks in the ocean which depend on temperature. (For example, the current ice free parts of the Arctic Ocean are enhancing CO2 loss).
People always appeal to efficiency to fob off CO2 as a metric of the economy. It reminds me of fusion power, it is always a couple of decades away. So were the 1990s so technologically backward compared to the present? How about most of the 2000s when the CO2 emissions were ramping up from year to year? CO2 emissions grow together with the GDP for obvious reasons. The modern GDP paradigm requires annual growth and no steady state economics regime is being advocated or established.
The graph I posted (thanks to the discussion on one of the climate threads) shows that there was a large increase of GDP between the mid 1990s until the last three years. This is globalization in action and the growth of consumer economies in China, India, and elsewhere. The current stall cannot be attributed to magical new technologies. The scale is all wrong. Solar and wind power are less than 2% of the global energy production. How can such a small number, which was even smaller in 2000, account for the shape of the CO2 emissions curve? It can't.
If someone is going to argue that cars are emitting less CO2 than 20 years ago, I have some prime Florida swamp land for sale that may appeal to them. Average vehicle CO2 emissions have not dropped that much since everyone just needs to drive an SUV and the global car inventory has increased thanks to China and India.