Fossil fuels 'must be phased out by 2100', says UN

United Nation's Intergovernmental Panel on Climate Change warned that use of fossil fuels should be phased out by 2100, otherwise it will dangerous to the climate change.

The expert panel said that most of the world's electricity can and must be produced from low-carbon sources by 2050, otherwise the world would face "severe, pervasive and irreversible" damage, the BBC reported.

The UN said inaction would cost "much more" than taking the necessary action and their report, which is intended to inform politicians engaged in attempts to deliver a new global treaty on climate by the end of 2015, suggests that reducing emissions is crucial if global warming is to be limited to 2C - a target acknowledged in 2009 as the threshold of dangerous climate change.

The report suggests renewables will have to grow from their current 30% share to 80% of the power sector by 2050 and fossil fuel power generation without carbon capture and storage (CCS) technology would need to be "phased out almost entirely by 2100.

The IPCC's Synthesis Report was published on Sunday in Copenhagen, after a week of intense debate between scientists and government officials.