In his State of the Union address in 2003, President Bush supported the idea of changing from the use of internal combustion engines to fuel cells based on hydrogen as a way of reducing air pollution and the emission of greenhouse gases. Fuel cells are nonpolluting because they only emit water vapor. President Bush proposed having the government subsidize research and development of hydrogen fuel and fuel cell technology. The president did not propose raising taxes on gasoline as a way of encouraging the use of fuel cells and reducing greenhouse gases. Would an increase in the tax on gasoline encourage the development of hydrogen-based fuel cell technology for automobiles?