(A) No,this practice is not environmental-friendly because it results in the wastage of fossil fuels and contributes to air pollution due to increased carbon emissions.
Suggestion: The teachers should adopt car-pooling or use public transport.
Justification: By sharing a vehicle,the total number of cars on the road decreases,which directly reduces fuel consumption and the amount of pollutants released into the atmosphere.
$(b)$ Two other ways to become environmental-friendly are:
$(i)$ Using public transport instead of private vehicles to reduce traffic and emissions.
$(ii)$ Using fuel-efficient modes of transport or switching to electric vehicles to minimize the carbon footprint.