The Worldwide Energy Budget  Examining worldwide energy use is
important for two related reasons. First, one of the most thorny
issues in setting a course toward sustainable energy is the
problem of which countries should bear the cost of shifting
their energy use. Currently, developed countries use far more
energy per capita than developing countries do, and developing
countries are understandably reluctant to inhibit their economic
growth by agreeing to any restrictions in how they generate
energy. At the same time, the magnitude of the problem we are
facing with our energy supply can only be understood by asking
the question, "What if developing countries do manage to bring
themselves up to the level of the developed ones?" Therefore,
the second reason for looking at worldwide energy use is that it
provides rough guidance about what demand might look like in the
future.  Table 1 quantifies the amount of energy consumed and
the amount of greenhouse gases emitted by the five largest
economies in 2005. The to