The Group of 20 (G20) major economies meeting in India failed on Saturday to reach consensus on phasing down fossil fuels following objections by some producer nations.

Scientists and campaigners are exasperated by international bodies' foot-dragging on action to curb global warming even as extreme weather from China to the United States underlines the climate crisis facing the world.

The G20 member countries together account for over three-quarters of global emissions and gross domestic product, and a cumulative effort by the group to decarbonise is crucial in the global fight against climate change.