Figure SPM.2: Carbon in
oil, gas and coal reserves and resources compared with historic fossil fuel carbon
emissions 1860–1998, and with cumulative carbon emissions from a range of
SRES scenarios and TAR stabilization scenarios up until 2100. Data for reserves
and resources are shown in the left hand columns (Section 3.8.2). Unconventional
oil and gas includes tar sands, shale oil, other heavy oil, coal bed methane,
deep geopressured gas, gas in acquifers, etc. Gas hydrates (clathrates) that amount
to an estimated 12,000GtC are not shown. The scenario columns show both SRES reference
scenarios as well as scenarios which lead to stabilization of CO2 concentrations
at a range of levels. Note that if by 2100 cumulative emissions associated with
SRES scenarios are equal to or smaller than those for stabilization scenarios,
this does not imply that these scenarios equally lead to stabilization.
