The Intergovernmental Panel on Climate Change's (IPCC) fourth Assessment Report shows that in order to reach that objective, global emissions of greenhouse gases must peak by 2020.
Den fjerde vurderingsrapport fra Det Mellemstatslige Panel om Klimaændringer (IPCC) viser, at for at nå det mål skal de globale emissioner af drivhusgasser kulminere i 2020.