Have to agree.

Here's the fun bit, though..

If we add up all conventional oil, conventional gas and easily-mined coal, get the total CO2 emitted and assume half is absorbed (empirical observation), I believe that final atmospheric CO2 hits circa 450-500ppm, which is at the outer limit of 'manageable' climate change. Probably.

If you start adding in tar sands, assorted non-con gas and especially gasified coal seams.. well, just don't bother with property lass than 12m above sea level.

"12m above sea level"?
Sounds optimistic. But may be true if you only think about people like you and me (as most people do, sadly).
But our children and grandchildren (as far as they survive) should move quite a bit more up the hills: If the 25,4 million km³ of Antarctic ice melt away (e.g. due to feedback mechanisms) this would lead to a sea level rise of 57 meters (187ft). At that stage you can be sure the Greenland's ice sheet will also be gone, adding further 7,3 metres (23ft) to the sea level. (As far as I remember the sea level of the ice-free periods of earth history was even close to 100m above the current level, but I don't find the data right now.)

Roughly speaking: In the end phase of this coal-economy greenhouse scenario all the (dark) green areas of a present day world map will be "blue" then - supposed that the remaining population will still have things like world maps.