De Forenede Nationers Miljøprograms rapport om emissionskløften »Emissions Gap Report 2012« skitserer, at ubetingede løfter giver en reduktion på ca. 4 G tCO2e, sammenlignet med at der er behov for en reduktion på 14 GtCO2e for at holde sig under loftet på 2 °C.
The Emissions Gap Report 2012, United Nations Environment Programme (UNEP), outlines that unconditional pledges amount to reductions of approximately 4 GtCO2e, compared with a median estimate of 14 GtCO2e of reductions necessary to remain below the 2 °C ceiling.