New Scientist: International Air travel looks set to go greener. A global United Nations agreement announced last week means that international airlines will have to curb their greenhouse gas emissions from 2020. The deal seems like a big step forwards for efforts to tackle climate change, but so far it is unclear how powerful the controls will really be.
The deal, announced on 4 October, was brokered by the International Civil Aviation Organization (ICAO), a branch of the United Nations that regulates international...