New Scientist: It is getting progressively cheaper to pollute the atmosphere. The price of permits to emit carbon dioxide has crashed, falling to 9.30 euros ($12) per tonne of CO2 on Tuesday, close to the all-time low of 8 euros. In the medium to long term, this might affect the European Union’s ability to meet its ambitious targets for reducing emissions by 20% by 2020 relative to 1990 levels. A low price is bound to have more immediate effects too. Will it affect the Kyoto …