Under the deal, India has committed to ensuring that at least 40% of its electricity will be generated from non-fossil sources by 2030.
CO2 emissions are believed to be the driving force behind climate change.
Last December in Paris, countries agreed to cut emissions in a bid to keep the global average rise in temperatures below 2C.
The Paris deal is the world's first comprehensive climate agreement.
It will only come into force legally after it is ratified by at least 55 countries which between them produce at least 55% of global carbon emissions.