The governor of the Bank of Portugal has called the measures that the European Commission has taken.
Nearly 200 nations, including the US, agreed in 2015 to voluntarily reduce their greenhouse gas emissions in an effort to combat climate change.
China has been the world's biggest emitter of greenhouse gases stoking global warming since 2007.
Earth is likely to reach more dangerous levels of warming even sooner if the US retreats from its pledge to cut carbon dioxide pollution.
The organization has also recorded at least 1,530 deaths on the Mediterranean in 2017.