World carbon emissions dropped by an estimated 7% this year as economic activity slowed as a result of the coronavirus pandemic.
However, a study predicts emissions might rebound higher in 2021 as international economies attempt to make up for lost time.
The Global Carbon Budget Report, considered to be the most comprehensive analysis of carbon output, broke down each country's emissions and compared them with data collected over previous years.
The report published Friday showed France had the largest fall in emissions - with a 15% drop compared with last year. The UK was second with a 13% drop compared with 2019. The falls reflect the severity of lockdowns in both countries - which were forced to reduce economic activity and movement.
Worldwide, lockdowns resulted in a record drop in carbon emissions from fossil fuels of about 2.4 billion metric tons. This is equal to about 34 billion tons of carbon dioxide throughout the year.
China's emissions are expected to be equal, if not higher, this year. Researchers believe China might surpass its 2019 emissions as it increases production to meet demand. The study said China was the first to enter and to lift lockdowns.
The study concluded a rebound in emissions was almost certain as governments around the world attempt to restart economies. Researchers said the drop was mainly a result of "temporary behavioral changes" rather than structural reforms.
"It is clear that emissions are edging back to 2019 levels already - but it is too early to say what the rebound will be in 2021. Whether they come back to 2019 levels or peak even higher economic packages will make a difference," one of the study's contributors said.
The last time world emissions fell was during the financial crisis of 2008-2009. The study said the rebound the following year was one of the largest.
