It is bad to pollute the environment with carbon emissions
Greg has had a busy morning around the house and is running late a bit late to work.
Greg wants to get to work on time.
Greg hops on his bicycle and pedals to work as quickly as he can.
Greg gets dressed and drives himself to work in his large SUV.
Greg's biking is environmentally friendly and does not release any carbon into the atmosphere.
Greg's vehicle emits a significant amount of carbon as he drives which pollutes the environment and contributes to global warming.