a. Pollution of the environment
Rainfall has decreased and the growth of some crops has been seriously affected
b. To tax on the air travel will increase the price of the tickets. Price increase, the quantity of demand will
decrease.
c. To tax on the air travel, air plane company will have attract more consumer, because the company have
more money to develop the device and the service. It will also attract more highly competent service staff,
because it can pay higher profit for them.