- India has the world's fifth largest coal reserves, but not enough to feed demand for fuel
- Amid pressure to reduce emissions, the country is trying to ramp up alternative energy options
- Around 300 million Indians still live in darkness -- equivalent to the entire U.S. population
(CNN)Holding onto the rails of a cage, we descend lower and lower into the coal mine. It is pitch dark, hot and humid. Every now and then a spray of water drizzles on us.