So, rather than call for arbitrary limits on carbon dioxide emissions, perhaps the best thing the United Nation's Intergovernmental Panel on Climate Change, and the climatology community in general, could do is to spend their efforts on determining the optimal range of carbon dioxide needed to extend the current interglacial period
alpinus became reduced and fragmented during the latest interglacial period
. The process of fragmentation of the species suitable habitat was probably gradual.
The team found that while the ice sheet elevation fluctuated, there was evidence of persistent ice sheet conditions for 1.4 million years, a discovery demonstrating that at least a sizeable ice sheet survived several warm interglacial periods
It is not surprising that many Quaternary geoscientists consider them to be sources of the most comprehensive data for tracing environmental changes on the continent through the series of glacial and interglacial periods
. The sections are mostly located within the limits of the most extensive ice sheets--Don (MIS 16) and Dnieper (MIS 6) ones--and in the periglacial zone of the Valdai/Weichselian and some previous glaciations (Fig.
True Evidence suggests temperatures during past interglacial periods
sometimes exceeded today's averages, in some cases for at least several thousand years.
Knowledge of the climate of past interglacial periods
is essential for our understanding of current climate and the forces driving global change.
These are long periods of time during which the climate varies between colder glacial periods--when sheets of ice cover large parts of Earth's surface--and warmer interglacial periods
We have been through several previous interglacial periods
when our latitude became subtropical.
The heavy isotope of oxygen ([sup.18] 0) is preferentially enriched in seawater relative to ice, so glacial periods are characterised by higher [sup.18] O in the oceans than during interglacial periods
like the present.
Ocean water, meanwhile, became significantly heavier during glacial periods because of the removal and storage of low-[sup.18]O ice on the continents, and the shells of marine organisms that formed during those times contain greater concentrations of [sup.18]O than those formed during interglacial periods
The relatively recent geological past (the last 1.6 million years), known as the Quaternary period, is characterized by large climatic swings from ice age to warmer interglacial periods
similar to the present one.