China’s three biggest power firms, Huaneng, Datang and Guodian, produced more greenhouse gas emissions last year than the whole of the UK, according to a Greenpeace report.

The group warned that inefficient plants and the country’s heavy reliance on coal are hindering efforts to tackle climate change.

According to Greenpeace, the top ten companies, which provided almost 60% of China’s total electricity last year, burned 20% of China’s coal and emitted the equivalent of 1.44 billion tons of carbon dioxide.

While China’s emissions per capita remain far below those of developed countries, the country as a whole has surpassed the United States to become the world’s largest emitter.