Energy and Electricity - Introduction to Carbon Capture and Sequestration - page 11

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Figure 1.2.4 Options to reduce carbon emissions
Fifteen possible wedges based on existing technologies that each avoid 25 billion tonnes
of carbon production over a period of 50 years. It is important to note that achieving each
wedge is not easy; it is in fact at the edge of what is feasible with current technology.
Success requires global implementation. Figure adapted from Pacala and Socolow [1.4].

Geographic, cultural, and global political issues loom as we consider
limiting carbon emissions. Because the bulk of past carbon emissions
was confined to a few regions (e.g., the USA and Europe), it is very dif-
ficult to argue against the logic that the responsibility for the reductions
should be shouldered by the historically highest emitters. However, if this
logic means that other countries agree to take action only if their own
emissions per capita exceed those of the USA, then a global solution will
remain elusive.