Factcheck: US and Iran are world’s only major emitters without net-zero targets – Image for illustrative purposes only (Image credits: Unsplash)
Debates over climate policy in Britain have intensified in recent months, with some opposition voices arguing that the country’s net-zero commitment puts it at a competitive disadvantage. Yet data compiled through May 2026 shows that the United Kingdom is far from alone. Of the world’s 198 nations, 140 have now adopted some form of net-zero target, covering roughly three-quarters of global emissions. Only two of the twenty largest carbon dioxide emitters remain without such a goal: the United States and Iran.
Scale of International Commitments
The breadth of adoption becomes clear when examining how countries have formalised their targets. Thirty-four nations, including the United Kingdom, have embedded net-zero into domestic law, the strongest legal signal of intent. Another sixty-three have outlined goals in official policy documents, while sixteen have issued public pledges and twenty-three maintain active proposals. Four countries report they have already reached net-zero status.
Collectively these measures now encompass 74 percent of worldwide emissions, according to the Net Zero Tracker consortium. The pattern holds across both developed and emerging economies, demonstrating that net-zero planning has become a mainstream feature of national strategy rather than an exception.
Timeline of Adoption Among Leading Emitters
The United Kingdom set the precedent among major economies when it legislated its net-zero target in 2019. China followed in 2020 with its own commitment, and in 2021 India, Saudi Arabia and Russia each announced targets. This rapid sequence left the United States and Iran as the only two top-twenty emitters still without national goals by mid-2026.
Under the previous administration the United States had maintained a federal net-zero target, yet that framework was set aside after the change of government. Even so, eighteen American states and forty-three cities continue to operate their own net-zero commitments. Iran has maintained no equivalent national target throughout the period.
Practical Consequences for Energy Security and Growth
Countries that have pursued net-zero pathways have often reduced their reliance on imported fossil fuels, a shift that carries direct implications for price stability and geopolitical exposure. The United Kingdom, for instance, has cut emissions by more than half since 1990 while expanding its economy. Similar patterns appear in other nations that adopted targets early, where investment in domestic renewables and efficiency measures has helped insulate economies from oil-market volatility.
Stakeholders affected by the absence of targets include national governments facing future energy-price shocks, industries dependent on stable fuel costs, and citizens who ultimately bear the expense of imported energy. The current situation in Iran, where dependence on oil exports remains high, illustrates one end of the spectrum; the United States, despite its domestic production capacity, still confronts regional and municipal efforts that diverge from federal policy.
Stakeholder Perspectives and Policy Implications
John Lang, who leads the Net Zero Tracker, has noted that the two largest emitters without targets are precisely those most exposed to the risks highlighted by recent energy-market disruptions. He has pointed out that resisting net-zero measures effectively increases vulnerability to both price swings and supply interruptions. For the United Kingdom, the data suggest that maintaining its existing framework aligns with the direction taken by the majority of comparable economies.
Business groups, regional authorities and international partners continue to monitor how the remaining outliers adjust their approaches. The contrast between nations that have codified targets in law and those that have not underscores differing levels of long-term planning certainty for investors and trading partners alike.
Key points at a glance
- 140 of 198 countries now hold net-zero targets of some kind.
- Only the United States and Iran among the top twenty emitters lack national goals.
- 74 percent of global emissions fall under existing net-zero commitments.
- Thirty-four countries have placed targets into binding legislation.
The pattern of adoption since 2019 indicates that net-zero planning has become a shared reference point for most major economies. How the two remaining outliers respond will shape both their own energy trajectories and the broader context in which other nations calibrate their policies.
