Clearly conservation must be part of the strategy.
For example, more efficient use of lighting and heating can contribute to less electrical demand.
More efficient vehicles, especially personal transportation, should be encouraged. It seems that automobile companies would rather build profitable SUV's than cars with more fuel efficiency, because that's what the market demands. On the other hand, the IRS has been offering a $35,000 rebate on Hummers (which cost $106,000) for "business" use - but then one can use them for personal use before and after working hours. The rebates for hybrid cars have been on the order of $1000-$2000. (source: Graydon Carter, "What We've Lost", p. 155-156, 2004).
An increase of 3 miles/gal (mpg) in fuel efficiency could save the US on the order of $25 billion and reduce annual CO2 emissions by 155 million tons. (source: Graydon Carter, "What We've Lost", p. 156, 2004).
To deal with CO2 - plant trees - lots of trees. For every tree I remove from my property (I have to cull diseased trees that were planted too close), I plant one or more. I see a lot of open space that could use some trees. The shade of trees can actually reduce energy costs in the summer time, and provide wind breaks which cut heating costs in winter.
Reforestation in parts of the world, particularly Africa, could significantly reduce CO2 burden, reduce global temperatures, and even increase rainfall in Sahel, Sahara and Arabian Peninsula.
As for nuclear power - new reactor and plants designs are ready to go.
BNFL/Westinghouse
AP-600: http://www.ap600.westinghousenuclear.com/
AP-1000: http://www.ap1000.westinghousenuclear.com/
The AP600 received its final design approval from the U.S. NRC in September 1998, and the design certification in December 1999. The AP-1000 just received its final design approval (FDA) from NRC on Set. 13, 2004
AREVA (Framatome/Siemens) -
EPR (European Pressurized water reactor). EdF has announced plans to build the first EPR (a 1600 MWe unit) at Flamanville, in the Basse Normandie region of northern France. Construction would begin in 2007 and would last 5 years with the unit on-line in 2012. TVO has selected the EPR for the third unit at Olkiluoto (http://www.tvo.fi/362.htm)
GE has the Advanced Boiling Water Reactor (ABWR) - The ABWR is the proud recipient of U.S. Standard Design Certification #1, issued on May 2, 1997.
http://npj.goinfo.com/NPJMain.nsf/0/5e5a077946dd6292862569f40079c3cd?OpenDocument
http://www.nuc.berkeley.edu/designs/abwr/abwr.html
Two units, Kashiwazaki-Kariwa 6 and 7, are operating in Japan since 1996 and 1997 respectively, and two units are under construction in Lungmen, Taiwan. http://www.power-technology.com/projects/lungmen/