The latest political crusade is the crusade to replace ordinary light bulbs with the new CFL light bulb that is supposed to save electricity, reducing the need for fossil fuels and helping the fight against global warming.

Since crusaders seldom stop to weigh the cost of what they are advocating, it is especially important that the rest of us do so before we get swept along by rhetoric and emotions.

With the CFL light bulb, the initial cost — several times that of a regular light bulb — is only the financial cost. A bigger problem is what to do if a CFL light bulb breaks.