Carpool in USA

I need a full research about Carpool in the USA.
It should be related to energy conservation.

Research must include:
– Why Carpool?
– Before and after carpool.
– a detailed statistics report. (Numbers and graphs)
– The impact of Carpool on energy, environment, society.
– Pros and Cons.

– What are the consequences did the government face when they came up with the carpool idea (e.g. people awareness)
– How carpool affected energy in the USA.

It should be at least 6 Pages.

Thank you,