Here are the numbers: pre-industrial revolution, the concentration of CO2 in the atmosphere was roughly 280 parts per million ppm. ❋ Tom Weis (2011)
One potential new pilot, from "Lost" co-creator J.J. Abrams, is set in a future that has been reduced to pre-industrial technology. ❋ Sam Schechner (2012)
“Bringing up anything pre-industrial revolution is a joke”: ❋ Unknown (2009)
According to a recent UNEP assessment, by 2100, the world can expect global average temperature rises between 2.5˚C and 5˚C 4.5˚F-9˚F over pre-industrial levels even if all the greenhouse gas emissions cuts pledged by countries in the UN climate negotiations are fulfilled. ❋ Manish Bapna (2011)
If global warming is to be limited to 2ºC above pre-industrial levels, global emissions need to peak between 2015 and 2020, and then decline rapidly, eventually reaching a decarbonized society with net zero emissions. ❋ Unknown (2010)
Note – this is not to say that being a hunter-gatherer is a great life, just that pre-industrial agricultural life was really, really, really bad. ❋ Unknown (2009)
That means a lot in terms of global warming – world leaders have pledged to try to limit global temperature rises to no more than 2C above pre-industrial levels, because scientists regard that as the limit of safety, beyond which climate change would become catastrophic and irreversible. ❋ Unknown (2011)
Scientific measurements of levels of CO2 contained in cylinders of ice, called ice cores, indicate that the pre-industrial carbon dioxide level was 278 ppm. ❋ Unknown (2010)
If we ever manage to get to the point where net emissions of greenhouse gases from human activities is zero, the planet will eventually (probably, over centuries) return to pre-industrial atmospheric concentration levels (about 270 parts per million), as the carbon gets reburied. ❋ Unknown (2009)
Also James stating there is a ‘only tool’ to bring carbon dioxide back to pre-industrial levels … is a kinda singular thought. ❋ Unknown (2009)
One of the questioners pointed out that there is also some confusion between whether the2°C is supposed to be above pre-industrial temperatures. ❋ Unknown (2009)
To put it more simply, a hunter-gatherer lifestyle takes much less work than a pre-industrial agricultural lifestyle. ❋ Unknown (2009)
Finally however, after visiting outlying farmsteads little changed from the pre-industrial age, enough original patterns were found to jump start kilim production on an organized basis. ❋ Unknown (2009)
Contrast that with something ridiculous like 12 hours a day to maintain a farm by pre-industrial methods. ❋ Unknown (2009)
Also, the Depression period really only lasts for sixteen years, so I suppose it would depend on your definition of decline, in chronological terms (I would say at least 50-100 years in the industrial era, 100-200 years in the pre-industrial era, but those are completely arbitrary). abb1 Says: ❋ Unknown (2010)
