Half-way measures to deal with climate change will make little difference, such as what Obama proposes.
By the year 2100, the global demand for power will increase by about FOUR TIMES as poor countries strive to lift their people out of poverty. That includes power for heating, cooling, lighting, cooking, transportation, sea water desalination, manufacturing, etc. To reduce CO2 emissions to acceptable levels, about 90% of that power must come from non-CO2 emitting sources.
Renewables, because of their intermittent nature, can make only a very minor contribution towards reducing CO2 emissions. Renewables are useful only under very limited circumstances.
It is only nuclear power that can adequately reduce CO2 emissions so that 90% of global power will come from non-CO2 emitting sources. Unfortunately, the anti-nuclear crowd, by making government leaders afraid even to mention nuclear power, are leading us down a very destructive path.
Even though our current nuclear power technology is worse than mediocre, it still has a far better safety record than any other currently used power generating technology. It is capable of reducing CO2 emissions to an acceptable level and should be greatly expanded until we develop a better nuclear technology.
The reason we are temporarily stuck with a bad nuclear technology is that funds for R & D for better nuclear technologies were cut off in the late 1960s else we would already be using a better, more economical, more efficient, and safer nuclear power technology. The liquid fluoride thorium reactor (LFTR) looks especially promising, partly because it cannot melt down, but there are also other nuclear technologies that could be used to replace our current pressurized water nuclear reactors.
Our government leaders should get over their fear of the anti-nuclear crowd and do what should be done, i.e., greatly expand nuclear power while supporting research for better nuclear technologies.