Fuel efficiency and pollution mandates already occur through the Corporate Average Fuel Economy. Vehicles today, through the standards, are so much better than they were before. In fact, when people now try to commit suicide by locking themselves in a garage with the car on, there is enough leaks in a garage that it is near impossible. [1]

Telecommuting works, but it has been proven to have deleterious effects on workers and their progression within a company. If you are willing to take a risk on your career, then do it.

Cars are not subsidized. Gas is taxed as a usage fee at the state (14%), Federal (12%), and local (2%). Public roads are paid for by its users, however, the plateauing of revenues because of the CAFE standards has lead to the development of toll based roadways, which do not need subsidies.

Public transportation is socialist as it takes money from the gas taxes paid for by the public roadway users and heavily subsidizes public transportation. There is always a discussion to raise the rates on public transportation users to fully pay for its costs, but there is an outcry from its users. This is not to say that I am against it, public transit provides employment opportunities to low-income individuals who are not able to afford vehicle access. This is a public good that I am okay with using my taxes for.

[1] https://en.wikipedia.org/wiki/Corporate_Average_Fuel_Economy

[2] http://www.brookings.edu/es/urban/publications/gastax.pdf