I am really encouraged by President Obama’s commitment to clean energy and combating climate change. I just have three worries: whether he has the right policies, the right politics and the right official to sell his program to the country. Other than that, things look great!

Last week, House Democrats, with administration support, introduced a 600-page draft bill on energy and climate. At the center of it is a plan to reduce greenhouse-gas emissions through a complicated cap-and-trade system. These people have the very best of intentions, but I wish they would step back and ask again: Can cap-and-trade pass? Will it really work? And is it the best strategy, with all the bureaucracy it will require to monitor, auction emissions permits and manage the trading?

Advocates of cap-and-trade argue that it is preferable to a simple carbon tax because it fixes a national cap on carbon emissions and it “hides the ball”  it doesn’t use the word “tax”  even though it amounts to one. So it can get through Congress. That was true as long as no one thought cap-and-trade could ever pass, but now that it might under Mr. Obama, opponents are not playing hide the ball anymore.

In the past two weeks, you could hear a chorus of Republicans, coal-state Democrats, right-wing think tanks and enviro-skeptics all singing the same tune: “Cap-and-trade is a tax. Obama is going to raise your taxes and sacrifice U.S. jobs to combat this global-warming charade, which many scientists think is nonsense. Worse, cap-and-trade will be managed by Wall Street. If you liked credit-default swaps, you’re going to love carbon-offset swaps.”