In the cause of dealing with global warming, Al Gore proposes replacing payroll taxes with pollution taxes on CO2; Barack Obama supports “cap-and-trade,” in which businesses can emit CO2 to a certain level, after which they will need credits to do so; and John McCain leans toward cap-and-trade, but with an emphasis on subsidies for nuclear energy. T. J. Rodgers has strong opinions on each plan, and stresses overall that government should get out of the energy business.