But many climate scientists,
seeing unabated emissions, say exploration of such options is a must, at least as a backstop strategy if things really get out of control.
Not exact matches
The progressively earlier occurrence of these high CO2 levels — not
seen in somewhere between 800,000 and 15 million years — points to the inexorable buildup of heat - trapping gas in the atmosphere as human
emissions continue
unabated.
The record - setting temperatures of 2016 have
seen a small push from an exceptionally strong El Niño, but they are largely the result of the heat that has built up in the atmosphere over decades of
unabated greenhouse gas
emissions — as the spiral graphic makes clear.
«If current trends in CO2
emissions continue
unabated,» says Caldeira, «in the next few decades, we will produce chemical conditions in the oceans that have not been
seen for tens of millions of years.
When
emissions continue
unabated (RCP8.5 scenario), the IPCC expects 12 % to 54 % decline by 2100 (
see also the current probabilistic projections of Schleussner et al. 2014).
PS IPCC had predicted warming of 0.15 to 0.3 C per decade in TAR and 0.2 C per decade in AR4 — yet in actual fact, lolwot, we
saw «no warming» despite
unabated human GHG
emissions.
While I am pretty sure IPCC won't repeat the silly mistake of projecting global warming of 0.2 C per decade for the next two decades (as it did in AR4), it will be interesting to
see whether or not IPCC modifies its AR5 report to include the possibility of continued global cooling over the next two or three decades despite
unabated human GHG
emissions and concentrations expected to reach new record levels.
This point also becomes clear when one
sees that there has been no warming over the past decade or more despite
unabated human GHG
emissions and CO2 concentrations reaching record levels.