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52 Managing Global Warming
showing
areas
Stacked
(B)
proportions.
relative
showing J.)
percentages Btu¼1.044 10 18
Stacked Based on data from US Energy Information Administration online at www.eia.gov/totalenergy/data/annual/perspectives.cfm accessed 23 March 2015.
(A) quadrillion
1800–2000. 1
energy (Note: Btu.
of
sources Quadrillion
new of
to units
transition in
US amounts
2.4 absolute
Fig.
