Why is transport one of the most intractable factors in considering the global environmental problem?

• A. Our transport capabilities worldwide have not expanded fast enough for us to cope with the consequences of global warming
• B. Transport demand grows faster than possible technological improvements can reduce the output of greenhouse gases and the depletion of nonrenewable fossil fuel reserves
• C. Reducing the growth of the transport sector will hold back economic growth, and hence reduce the resources we have available to deal with the global environmental problem
• D. World oil refinery capacity has failed to expand in line with the demand for internal combustion fuels