Environmental Engineering Reference
In-Depth Information
Nuclear 2%
Petroleum 3%
Natural Gas 12%
Renewables 3%
Coal 8%
Coal 15%
Natural Gas 10%
Industry
Buildings
Renewables
3%
Petroleum 10%
Transportation
Nuclear 6%
Nuclear 0%
Renewables 0%
Petroleum 27%
Natural Gas 1%
Coal 0%
fig. 11.2
TPES by fuel and sector. (Courtesy of the
American Physical Society [
])
its regulators, we have been in what looks like a worldwide
recession, but the demand for oil continued its rise as the
growth of the developing countries continues.
Figure
shows how energy is used in the US econ-
omy.
The transportation sector uses
.
% of all the
primary energy and
% of it is oil-based. The buildings
sector uses
% of our total primary energy and a large
fraction of that is used to generate the electricity consumed
in commercial and residential buildings. The supply is
diverse because electricity generation uses so many differ-
ent primary energy sources (renewables in the
gure are
dominated by hydroelectric power and biomass). The US
Environmental Protection Agency (EPA) allocated
%
and
% of greenhouse gas emissions from energy use
I recently chaired a major study of ef
ciency in the US transportation
and buildings sector. Some of the material in this chapter comes from the
report which is available at
http://www.aps.org/energyef
