Geoengineering
Out of context: Reply #13
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- ZOOP0
"Antarctic ice cores show us that the concentration of CO2 was stable over the last millennium until the early 19th century. It then started to rise, and its concentration is now nearly 40% higher than it was before the industrial revolution (see Fig. 2). Other measurements (e.g. isotopic data) confirm that the increase must be due to emissions of CO2 from fossil fuel usage and deforestation. Measurements from older ice cores (discussed below) confirm that both the magnitude and rate of the recent increase are almost certainly unprecedented over the last 800,000 years." http://www.antarctica.ac.uk/bas_…
The fastest large natural increase measured in older ice cores is around 20ppmv (parts per million by volume) in 1000 years (a rate seen during Earth’s emergence from the last ice age around 12,000 years ago). CO2 concentration increased by the same amount, 20ppmv, in the last 11 years! Methane (CH4), another important greenhouse gas, also shows a huge and unprecedented increase in concentration over the last two centuries. Its concentration is now much more than double its pre-industrial level.
- earth 4 billion years, you should check why they never go more than 10k yearsGeorgesIV
- seriously, it is ridiculous to only compare the levels from 1000 years ago when we should compare it to a longer time span to make it validGeorgesIV
- That's not 1000 years it's 800,000, you'll need to slow down and read again.ZOOP