Based just on orbital forcing, and following
previous ice age cycles, we are due for a long period of gradual cooling to the next ice age.
I have to this date never seen these variations in actual solar activity / cosmic ray flux taken into account when modelling
previous ice age cycles, which I find deeply concerning.
Not exact matches
Ice ages have occurred in a hundred thousand year
cycle for the last 700 thousand years, and there have been
previous periods that appear to have been warmer than the present despite CO2 levels being lower than they are now.
It is my understanding that the
previous ice ages have ended in the past by a forcing from changes in tilt of the earth (i.e. Milankovitch
cycles).
We know there have been
previous ice ages and subsequent warming
cycles; we know when they were, and how much time elapsed between them.
This means that in
previous post
ice age warming
cycles, the Arctic
ice at the GISP2 site in central Greenland DID actually ALL melt.
The
ice at the GISP2 site in central Greenland was only one
ice age thick before they hit rock, (as opposed to Antarctica where the
ice is more than 6
cycles 700,000 years thick) indicating that ALL the Central Greenland
ice melted during the
previous warming
cycle (125,000 years ago).
Ice ages have occurred in a hundred thousand year
cycle for the last 700 thousand years, and there have been
previous periods that appear to have been warmer than the present despite CO2 levels being lower than they are now.
He also wants them to go over the history of climate change research, focusing on
ice ages and
previous cooling and warming
cycles, among other topics.
Ice ages have occurred in a 100,000 - year
cycle for the last 700,000 years, and there have been
previous interglacials that appear to have been warmer than the present despite lower carbon - dioxide levels.
Ice ages have occurred in a hundred thousand year
cycle for the last 700 thousand years, and there have been
previous periods that appear to have been warmer than the present despite CO2 [continue reading...]
Because all 2013 Intergovernmental Panel on Climate Change scenarios — except Representative Concentration Pathway 2.6 (RCP2.6), which leads to the total radiative forcing of greenhouse gases of 2.6 W m − 2 in 2100 — imply that cumulative carbon emission will exceed 1,000 Gt in the twenty - first century, our results suggest that anthropogenic interference will make the initiation of the next
ice age impossible over a time period comparable to the duration of
previous glacial
cycles.»
Anthropogenic warming has interrupted the Glacial - Interglacial
cycle of the Quaternary (Ganopolski et al., 2016; Haqq - Misra, 2014) and there will be no coming
Ice -
Age n - 1000 years from now to reseal all of this volatile Carbon, as happened at the end of each
previous interglacial.
The fact of
previous climate change due to «natural
cycles» is probably the strongest evidence we have that adding the same amount of heat will warm future climate about as much as the warming following the last
Ice Age.