%T Emissions trading - has it worked? %A Leslie Nielson %I Parliamentary Library (Australia) %D 2009 %K Emissions trading %U https://apo.org.au/node/18979 %X Emissions trading gets a lot of bad press. James Hansen, a leading advocate for climate change legislation, has rejected emissions trading altogether in favour of a carbon tax. In an open letter delivered on 29 December 2008 to then President-Elect Obama, Dr Hansen described cap-and-trade schemes as ‘ineffectual and not commensurate with the climate threat’. %9 Briefing paper