"... Continuation of high fossil fuel emissions, given current knowledge of the consequences, would be an act of extraordinary witting inter-generational injustice. Responsible policy making requires a rising price on carbon emissions that would preclude emissions from most remaining coal and unconventional fossil fuels and phase down emissions from conventional fossil fuels..."
James Hansen et al, in recently published Assessing Dangerous Climate Change http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0081648
The message hasn't changed, except that it is more urgent.