Environmental Engineering Reference
In-Depth Information
20
15
10
5
0
-5
2000
2060
2120
2180
2240
2300
Year
BAU
750 ppmv
650 ppmv
550 ppmv
450 ppmv
350 ppmv
fig. 15.1
Stabilization trajectories. Carbon emissions allowed if
the atmosphere is to be stabilized at one of several new levels.
Also shown is the BAU expectation. (Courtesy of Professor
John Holdren, Harvard University)
ppm, as advocated by
many, requires that we reach peak emissions around
ppm now. Stabilizing at
,
which I believe to be extremely unlikely given the growth
rate in the developing world. Stabilizing at
ppm is
doable, but not easily and not unless the developing
nations are brought into some emissions control system.
Because of
the broad range of model predictions,
C temperature rise. We shall
have to wait a while to know.
Almost all the industrialized nations continue to get a
bit more ef
ppm can lead to a
cient each year. Energy intensity (energy
needed to produce a dollar of GDP) in the US economy
has been declining by nearly
% per year (EIA estimate)
since
. Although the economy has grown at the same
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