Studies
of past climate changes suggest the land and oceans start releasing more CO2 than they absorb as the planet warms.
Scientists continue to investigate
past climate change events to better understand modern climate change, including extreme drought.
One major avenue of research strives to determine climate sensitivity by comparing varying CO2 concentrations
with past climate change.
Also, you seem to believe that
past climate change just happens when it fact climate always changes because of a change of forcings.
Understanding the factors that can influence temperatures near the tropical lower stratosphere is important for
interpreting past climate change and projecting future changes.
Several factors have
affected past climate change, including solar variability, volcanic activity and changes in the composition of the atmosphere.
This study
evaluated past climate changes over the previous 65 million years, considering nearly two dozen investigations of many different geological time periods.
Warming can be the result of a number of factors, so that the cause
of past climate change is not necessarily implicated in current climate change.
Recognition is slowly beginning to grow of the untapped resource of Indigenous knowledge
about past climate change in Australian and internationally, which could be used to inform adaptation options.
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Does Past Climate Change Tell About Global Warming?
Repairing the climate could be that simple, or at least that is what climate scientist Wallace Broecker and science writer Robert Kunzig propose in Fixing Climate:
What Past Climate Changes Reveal About the Current Threat — and How to Counter It (Hill and Wang, $ 25).
Folk and coauthors built a new set of computational tools to infer
how past climate change would have created new plant communities in the past where hybridization was possible.
He promoted the use of water stable isotopomers for
reconstructing past climate changes from ice cores and with associated atmospheric modelling using both dynamically simple and General Circulation Models (GCMs).
Indeed, the utility of the term in describing
past climate changes at regional scales has been questioned [see e.g. Jones, P.D., Mann, M.E., Climate Over Past Millennia, Reviews of Geophysics, 42, RG2002, doi: 10.1029 / 2003RG000143, 2004 and references therein.]
There is plenty of evidence of
past climate change which was abrupt on timescales of 10 - 100 years through the last glacial cycle and beyond.
Only one of those groups, Working Group I (WG I) is assigned to report on the extent and possible causes of
past climate change as well as future projections.
- The failure of the warmers to
acknowledge past climate changes such as the Medieaval Warm Period, especially the Mann hockeystick episode, which I feel has seriously damaged their credibility.
Those glittering stalagmites, which have been forming for tens of thousands of years, are what provided Georgia Institute of Technology doctoral student Stacy Carolin with a way to investigate how rainfall in this region shifted
when past climate changed.
Since the L&S model is so oversimplified, failing to account for changes in the natural forcings, they fail to accurately
model past climate changes.
Before we can understand what
past climate change meant for more animals — «there needs to be a lot more work on modern animals,» Secord says.
The fossil record suggests that most species persisted
through past climate change, whereas forecasts of future impacts predict large - scale range reduction and extinction.
Understanding how the bears
weathered past climate changes or sea ice — free conditions might help identify what could be done to help the unique animal survive.
Studies of
past climate change indicate that the AMOC has slowed a number of times, in surprisingly short periods, causing substantial cooling of Europe.