
106 Engineering Response to Climate Change
TABLE 3.3
GCAM Input Assumptions for the Six Scenarios
POP6/MDG+ POP6/MDG− POP9/MDG+ POP9/MDG− POP14/MDG+ POP14/MDG−
Sustainability and
Equity Collapse Consumerism
Muddling
Through
Social
Conservatism Crowded Chaos
Global Population (billion
in 2100)
Low (5.5) Low (5.5) Medium (9.1) Medium (9.1) High (14.0) High (14.0)
Per Capita GDP Growth
(000 USD in 2100)
Fast (66) Fast and Very
Slow (13)
Medium (56) Slow (36) Medium/Slow
(43)
Slow and
Divided (30)
Global GDP (trillion USD in
2100)
Medium (367) Low (74) High (505) Medium (323) High (600) High/Medium
(416)
Per Capita Energy Service
Demands
Lower Higher Higher Higher ...