To the heads of government of the top 25 greenhouse gas-emitting countries,
We urge you to ratify the Paris Agreement on Climate Change if you have not already done so, and to implement the measures necessary to fulfil the pledges you gave there without delay. Unfortunately, even if all governments implement the unconditional pledges they have made so far, global warming is still likely to reach about 2.7°C above pre-industrial levels. Therefore, much more vigorous action is necessary for a reasonable chance of limiting global warming to 2°C.
Furthermore, the Paris Agreement recognises that limiting global warming to 1.5°C rather than 2°C ‘would significantly reduce the risks and impacts of climate change’, and therefore governments meeting in Paris agreed that they would pursue ‘efforts to limit the temperature increase to 1.5°C’ (Article 2.1.(a)). Limiting global warming to 1.5°C requires even more radical and vigorous action.
Consequently, we also urge you to strengthen the pledges you have given, to put them in line with what is required to meet the 1.5°C target, and to implement the measures necessary to fulfil those pledges as quickly as possible. Such measures include accelerating energy efficiency efforts; rapid decarbonisation of the global energy and industry sectors; immediate removal of all fossil fuel subsidies; no new fossil fuel extraction projects or power generation plants; and urgent exploration, development, and scale-up of negative emission technologies.