Which countries have not ratified the Paris climate agreement?

More than five years after the Paris Agreement was adopted, six of 197 signatories have not formally backed the deal. South Sudan is the latest country to ratify

The Eiffel Tower in Paris, illuminated in green to celebrate the entry into force of the Paris Agreement, the most ambitious climate change agreement in history, on November 4, 2016 (Photo: Jean-Baptiste Gurliat/ Mairie de Paris)


Turkey and three large oil exporting nations are among six countries that have not yet ratified the 2015 Paris climate agreement. War-torn South Sudan ratified the accord in February 2021, meaning the deal has been formally endorsed by 191 of 197 nations.

The US withdrew from the agreement under president Donald Trump, with effect from November 2020. His successor Joe Biden rejoined the pact on his first day in office, 20 January 2021, and formally re-entered the global treaty 30 days later.

Iran, Iraq and Libya – all among the 14-member Organization of Petroleum Exporting Countries (Opec) – as well as Yemen and Eritrea have not ratified the agreement.

South Sudan, the world’s newest country which is torn by conflict, was the latest nation to ratify the deal on 23 February 2021.

Before that, Angola ratified on 12 August 2020, Kyrgyzstan on 18 February and Lebanon on 5 February.

Turkey is now the only member of the G20 not to have formally endorsed the deal after Russia ratified in October 2019.

The seven countries yet to ratify the accord account for about 4% of global greenhouse gas emissions, according to the European Commission’s emissions database. The US, the second largest emitter after China, accounts for 13%.

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Iran (1.66%), Turkey (1.04%) and Iraq (0.48%) are currently the top emitters among the nations that have not yet ratified. The others represent a far smaller share of global emissions: Eritrea (0.01%), Libya (0.14%), and Yemen (0.07%).

International agreements are initially signed to signal intent to comply, but only become binding through ratification. That can take an act of parliament or some other formal acceptance. Different countries have different processes. Former US President Barack Obama used disputed executive powers to ratify the Paris accord in 2016.

Once ratified, the agreement commits governments to submit their plans to cut emissions. Ultimately they will have to do their bit to keep global temperatures well below 2C above pre-industrial times and to “pursue efforts” to limit them further to 1.5C.

Niklas Höhne, a climatologist and founder of the New Climate Institute in Germany, said Turkey “stands out” among the list of countries yet to ratify the agreement.

Turkey is a “member of Organisation for Economic Co-operation and Development (OECD), has high economical ambitions, very good renewable resources, the potential to reduce emissions significantly and still plans for massive expansion of coal-fired power plants,” he told Climate Home News.

“Oil has been an important factor for economic security for several of these countries,” David Waskow, of the World Resources Institute think-tank in Washington, told CHN, noting common interests of both Opec nations and the US, the world’s top oil producer.

Big emitters yet to ratify:


Since the adoption of the UN climate convention in 1992, Turkey has more heavily relied on fossil fuels, particularly coal, to keep up with increasing energy demands. Its emissions increased 135.4% between 1990 and 2016.

In 2019, Turkey said it was on track to reduce the growth of its emissions by 21% below projected levels with no economic restraints by 2030.

Turkey has a peculiar beef with the Paris Agreement, stemming from its decision to sign up to the convention as a developed country.

Turkey has since argued that it is a developing country and has won special circumstances, allowing it to opt out of supplying finance. But it still cannot access climate cash, a condition President Recep Tayyip Erdoğan has said must change if Turkey is to ratify the agreement.

Air pollution caused 7 times more death than traffic accidents in Turkey in 2017 (Photo: Julian Nyča)


As a major producer of oil and natural gas exporter, Iran’s energy sector accounts for around 77% of its total emissions. Despite its fossil fuel empire, the country has developed a renewable energy industry thanks to a number of national plans and funds.

In November 2015, it pledged to reduce its emissions by 4% by 2030, compared to a business as usual scenario. Its national plan said cutting greenhouse gas emissions “will be facilitated and speeded up, only in the absence of any forms of restrictions and sanctions.”

Iran’s reluctance to ratify stems largely from its dependence on oil, complicated by the collapse of the July 2015 nuclear deal between Tehran and other major powers led by Washington.

Windmills in Manjeel, Iran (Photo: Ali Madjfar)

This article was last updated on 01 March 2021 after South Sudan ratified the agreement. 

Read more on: Climate politics | Paris Agreement | UN climate talks | World