For example, from Chapter 19, starting at the bottom of page 793:
"paleoclimateic evidence suggests that Greenland and possibly the WAIS contributed to a sea-level rise of 4-6 meters during the last interglacial, when polar temperatures were 3-5 degrees C warmer, and the global mean was not notably warmer, than at present. Accordingly, there is medium confidence that at least partial deglaciation of the Greenland ice sheet, and possibly the WAIS, would occur over a period of time ranging from centuries to millennia for a global average temperature increase of 1-4 degrees Celsius (relative to 1990-2000), causing a contribution to sea-level rise of 4-6 meters or more."

There are references to other studies and sections of the IPCC report that give more detail.

you never answered my question….So historically, when it has been 2 degrees F warmer than it is currently, did the Greenland ice sheet have a “slow but irreversible meltdown?”

Can you show me historical data that proves that the Grrenland ice sheet meltdown has ocurred in this past when temps were 2 degrees warmer than now?

I partially explained the grid science process in a comment in 4-11 here about his book.

All scientists have a great responsibility to do their own work and your support of the earths eco-system is very commendable to us.

We do ask though that you seek further answers as to the earths processes before you sign in to the GHG model of continued warming and the complete destruction of our earth based on the assumption of carbon being the culprit and the process escalating.

As I have stated,it is a periodical process and does have an ending date and magma temp and weather processes will return to stability,acceptable to those concerned.

Actually the facts are that we will have a much cooler period for a few years because as the energy componentry abates,it pulls some of our grid fields energy to it,just as comets pull energy to them. So be prepared for that eventuality.

We have oxygenation pouring in constantly from our grid field and methane will fall to ground as it always has.

Also as I have stated before in other formats,jet fuel pouring into our atmosphere creates most of the problems for our ozone shield as well of course the halogens.

I continually assert that the climate meetings ,if those scientist types were serious about the gases in our atmosphere would hold video meetings instead of assisting in the pouring of the carbon components all the way to their favorite vacation / meeting spot.

We have designed a complete train system and call for aircraft to only be used for over ocean flights to assist the oxygenation of the planet,which will never be fixed no matter how many wind plants or solar or the foolish carbon sequestration schemes as long as science folks do not support the remediation process with proper perspective as to the real issues of our eco-system.

We have also designed a complete trash remediation system so our aquifers will not be further destroyed.

There are plastic to oil processes to turn our plastic waste back to oil and we use that in our trash model along with a long list of other processes that always take things into perspective so as not to task against business or labor.

The list goes on and on of the new processes grid scientists wish to remediate our eco system with……..And it puts everyone to work.

i am sure there have been times in the last 500,000 years where global temps were warmer than they are today? and similar events (Greenland ice cap meltdown, Siberian permafrost methane emissions increasing).

you are basing your concerns about these future events since they have happened in the past correct?

so, can you point to links that show in the past when temps were warmer we had the GReenland ice pack meltdown and dangerous levels of methane released from the Siberian permafrost? how much warmer was it and how long ago did these events occur? can you back up your above statements with historical facts and events?