Global carbon dioxide emissions from power production flattened last year to 33 gigatonnes after two years of increases, despite expectations of another rise as the world economy expanded.
The International Energy Agency says the growth of renewable energy and fuel switching from coal to natural gas led to less emissions from advanced economies.
Milder weather in several countries and slower economic growth in some emerging markets also contributed, the agency said on Tuesday.
"We now need to work hard to make sure that 2019 is remembered as a definitive peak in global emissions, not just another pause in growth," IEA executive director Fatih Birol said.
Important news this morning: latest data from @IEA finds that global energy-related carbon dioxide emissions stopped growing in 2019. Necessary first step and a hope that CO2 could peak and start to decline this decade.
Our press release 👇https://t.co/jlDW5DFHZa— Jad Mouawad (@jadmouawad) February 11, 2020
China's emissions rose at a slower pace than previously due slower economic growth and higher output from low-carbon sources of electricity such as nuclear and renewables.
Emissions growth in India was "moderate" last year, according to the IEA.
Coal-fired power generation in the country fell for the first time since 1973 but fossil fuel demand in other areas such as transport offset the decline.
Emissions grew strongly in south-east Asia driven by robust coal demand.