One big problem is if America will be
able to prevent corruption despite absolute
military power. With Obama there is at
least a real chance to defeat Lord Acton,
who said "Power tends to corrupt, and
absolute power corrupts absolutely"
(an interesting psychological observation
BTW).
The largest shift and biggest challenge will be
the shift to sustainability and renewable energy,
the buzzwords everybody is talking about
but nobody really tries to achieve.
We are running out of oil and resources,
for example Phosphorus for mineral fertilizers,
or rare earth metals for technical products.
There is only a limited amount of
natural key resources, and some will be
running out already in 10-20 years, see
http://www.newscientist.com/data/images/archive/2605/26051202.jpg
-J.
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