Posted: March 11th, 2016

Comparing Light rail with buses Carbon Emission in Portland/Oregon

it should investigate the topic above deeply and in a professorial manner. The public transportation agency that operates in Portland is Tri-met. so, a lot of data should be retrieved from their websites. moreover, what are the ways that can be done to reduce carbon emission in Oregon as a result from public transportation. you can compare the results that you get with other state or city. 
Please don’t try to make the topic so broad. focus on this topic 
TRB reference.
you should use journal articles or technical reports.
Motivation, why is this topic interesting/important?