Warmth mostly gets created through fire, yes there are several other phenomenas also, but how can we reduce that fire production.
So, think about this, why not reduce the amount of fire we use in our daily routine. For example, rathar then using gas stoves for cooking, the alternative that is induction can be a best solution for the reduction of amount of heat that every kitchen produces.
So, the population of India is around 1.30 crore, and from that we can say that they're are around 50 crore homes. And if in each house induction coolers are being used instead of gas stoves then the number for heat generation can be reduced.