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.
