You are tasked with creating a monocentric circular city model with origins at (0,0) to study the effects of resident behavior on transit method choices and their overall impact on greenhouse gas (GHG) emissions. The average income of residents in the city is "I".

To create the model, you need to consider the following variables:

Total overhead costs of driving per mile (CO_D) vs. using a light rail per mile (CO_L).

GHG emissions per mile from both driving (EM_D) and using light rail (EM_L).

Your model should include a comparison of the total cost and GHG emissions of the two transit methods, based on different scenarios of resident behavior. For example, you could consider scenarios where more residents choose to own a car or use light rail, or where more residents choose to carpool or use public transit.

Your analysis should provide insights into the trade-offs between cost and emissions for different transit methods and behaviors and could be used to inform policies aimed at reducing GHG emissions in the city.