Taking public transportation and other ways of ride sharing are great ways to lower your carbon footprint.
Berkshire Regional Transit Authority (BRTA)
The Berkshire Regional Transit Authority (BRTA) provides detailed schedules and costs on their website. As of winter 2019, new routes and more frequent services are in the planning stages.
Share a ride
Carpooling makes sense if there is no public transit available from your home to work, you commute during times when public transit is not available, or you have a health condition that means you cannot take public transit.
Flying is the most energy-intensive form of transportation. Teleconference if you can. Use a bus or a train if that is reasonable. Alternatively, buy carbon offsets to help neutralize the carbon foot print related to your flight. Of course, buying carbon offsets does not actually reduce your carbon emissions but they may go towards construction of renewable energy projects and thus reduce future emissions. The Natural Resources Defense Council and the Sierra Club have helpful descriptions that will help you understand carbon offsets and what to look for when you buy them.