| This stands out: The most recent estimates suggest that at times between 5.2 and 2.6 million years ago (during the Pliocene), the carbon dioxide concentrations in the atmosphere reached between 330 and 400 ppm. During those periods, global temperatures were 2-3°C higher than now, and sea levels were higher than now by 10 – 25 metres. And the following: Atmospheric CO2 is currently at a level of 390 ppm. ----- So I take this to mean, it has not been seen before naturally - the current levels of atmospheric carbon dioxide - and a non-associated temperature change (and the associated sea level rise - which I personally would expect should rise in the event of any rising temperatures - I don't need evidence that ice melts at higher temps). I take this inability to prove that to mean further it is hard to observe the change temperatures in short time frames (think annually), but we can expect it would happen over time with our associated CO2 level, or we may be already in the middle of it and not know it. Meaning the associated problems (a significant rollover type of change) may occur in the generational terms (100 years). Do I have the gist of the main thrust? If so - then the logical conclusion being presented, is that the line is so fine - we may cross it without knowing it. |