Reduction in the usage of fossil fuels can be brought about bya.encouraging the use of mass transport systems such as buses and railwaysb.reducing car taxesc.using alternative energy sourcesd.changing lifestyles

The reduction in the usage of fossil fuels can be brought about by:

a. Encouraging the use of mass transport systems such as buses and railways: This can significantly reduce the number of private vehicles on the road, thereby reducing the consumption of fossil fuels.

b. Reducing car taxes: This option might not directly contribute to the reduction of fossil fuel usage. In fact, it might encourage more people to own private vehicles, which could potentially increase the consumption of fossil fuels.

c. Using alternative energy sources: This is a very effective way to reduce the usage of fossil fuels. Alternative energy sources such as solar, wind, and hydroelectric power are renewable and do not deplete our natural resources.

d. Changing lifestyles: This involves adopting practices that are more energy-efficient, such as using energy-efficient appliances, reducing the use of air conditioning and heating, and choosing to walk or cycle instead of using a car for short distances. This can significantly reduce our dependence on fossil fuels.