"The immediacy and scale of the reductions necessary to avoid anything below 4°C, and indeed the human and ecosystem implications of living with 4°C, are beyond anything we have been prepared to countenance.
"The aim of this conference is therefore to: (i) assess the consequences of a change in global temperature above 4°C for a range of systems and sectors, and (ii) explore the options that are open for avoiding climate changes of this magnitude.