The world's reliance on energy sources like oil and coal, some of the main culprits behind pollution, is dwindling, according to the World Bank.

"The model has been coal plus renewables, the model can be gas plus renewables. I think 10, 12 years from now, we will see renewables and storage and nothing more than that," Riccardo Puliti, the World Bank's global head of energy and extractives, told CNBC.