On Tue, Feb 11, 2014 at 3:41 AM, LizR <[email protected]> wrote: > On 11 February 2014 19:01, Richard Ruquist <[email protected]> wrote: > >> The Vostok ice core data, from which Atm. temperature and CO2 content >> have been extracted, suggests that at least for the last half million years >> climate change has been a natural occurrence, apparently based on >> fluctuations on earth-incident solar radiance. That is except for the last >> 10,000 years, when the climate has been relatively stable. My fear is that >> this relative stability will come to an end and we may return to the >> temperature fluctuations that typified the ice ages. >> > > Yes, imho it was most likely the interglacial that allowed agriculture to > flourish, and with it civilisation. > > As far as returning to fluctuating temperatures goes, increasing > atmospheric CO2 by a staggering 50% since 1800 won't have helped in that > department... >
That we are currently in an interglacial period suggests that another glacial period is coming(;<) In previous plunges into glacial periods, the CO2 atm content continued to increase for up to 1000 years after the temperature peaked. So IMO an increasing CO2 may actually be responsible for the plunge. The mechanism is that the increased atm energy abs produced by increased CO2 results in fluctuations in the jet stream down to most of the landmass in North America, and northern Europe and Asia, significantly increasing reflection from snow (rather than absorption) of solar radiation over land thereby cooling the earth significantly. Oceanic absorption would be relatively constant so climate change would be a Northern Hemisphere effect. > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
