There is an old political observation, people will do everything else then what is needed (if what is needed is unpopular with a large segment of the population) till it is force to do so. In the case of Peak Energy, as long as other sources of energy are available, people will opt for those sources instead of making fundamental changes.
People will look to hybrids and electric cars instead of moving nearer work, people will opt for more pollution then to opt to have fruits only in season. etc,
People will opt for mopeds and bicycles only when they can no longer afford to operate an automobile. People will insist on the type of house they have at present, rather then abandon it to live closer to stores and work.
All this means in Global Warming and Peak Energy will work together to change society. As temperatures rise, we will want more Air Conditioning which requires more energy. The problem is energy will be harder to find, and sooner or later the option to buy will no longer exists for the price will be to high. Thus energy use will drop, as will carbon release. Then after 20-30 years you will see a drop in temperatures as the carbon is slowly absorbed.
Carbon is absorbed by the ocean at a fairly steady rate, absorption goes up as the amount of carbon increases in the atmosphere but these rates are way below the present release levels of carbon and that appears to have been the situation for centuries (Actual documentation is only from the 1960s when carbon measurements in the Atmosphere was first kept, but indirect measurements indicate that has been the case since the 1600s when the "Little Ice Age" "peaked" and you saw a slow increase in temperatures since the 1600s).
Side note: The "Little Ice Age" seems to peak during what is called the "Maunder Minimum" of 1645-1715. The "Maunder Minimum" seems to indicate less sun energy hitting the earth and thus a drop in temperture. An increase in temperature occurred afterward and accelerated since about 1830.
http://en.wikipedia.org/wiki/Maunder_Minimum
http://en.wikipedia.org/wiki/Sp%C3%B6rer_Minimum
The serve winter of 535 AD (That is the year, Justinian decided to reconquer Italy from the Goths who ended up in charge of Italy when the Western Empire Collapsed in the mid 400s).
More on the bad winter of 535 AD:
http://en.wikipedia.org/wiki/Climate_changes_of_535%E2%80%93536
More on Justinian's Italian Wars:
http://en.wikipedia.org/wiki/Gothic_War_(535%E2%80%93554)
List of bad climate events:
http://en.wikipedia.org/wiki/Timeline_of_environmental_events
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