The share of fossil fuels in the world's total energy mix is as high as a decade ago, despite the falling cost of renewables and pressure on governments to act on climate change, a report by green energy policy network REN21 showed on Tuesday.

Fossil fuel use has persisted amid rising global energy demand, continued consumption and investment in new fossil fuel plants, and lower use of biomass energy — such as wood or agricultural waste — in heating and cooking, the report said.

Burning fossil fuels such as coal, gas and oil creates carbon dioxide, the main greenhouse gas which contributes to global warming.