ABSTRACT
The ample historical and natural evidence of past natural climate changes raises another issue. Meanwhile, the very high cost of non-fossil sources of energy makes it unlikely that restricting the use of fossil fuels through taxes or direct controls is the most efficient response to the threat of climate change from CO2 emissions. The larger the non-CO2 components of climate change, and the more variable the effects geographically, the stronger the case for limiting the chance or magnitude of harmful consequences from climate change, or taking measures that improve recovery from damaging weather events. The notion of energy security also has economic dimensions. Longer term energy security for the world can be increased most effectively by diversifying energy sources and the range of regions from which they come, and especially by increasing supply from more stable countries. Several policies have been proposed to deal with energy insecurity.
