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The problem isn’t climate-change denial. It’s doubt that climate activists have the answers.

Last week French environmental minister Nicolas Hulot, once a prominent supporter of President Emmanuel Macron, threw in the towel. “I don’t want to lie anymore. I don’t want to create the illusion that my presence in the government means that we are on top of [environmental] issues,” he said during a live broadcast announcing his resignation.

Mr. Hulot is not alone among environmentalists in denouncing the hypocrisy and inadequacy of government action on climate change. The Paris accords are “a fraud, really, a fake,” said climate activist James Hansen in 2015. “There is no action, just promises.”

Three years later, Mr. Hansen’s words look prescient. Even ostensibly committed countries like Germany and France are on course to miss the voluntary 2020 targets they announced to such fanfare in 2015. The Climate Action Tracker estimates that only Morocco and Gambia are on a “Paris agreement compatible” path.

The climate-change movement is stuck, even after a scorching summer elevated the issue across much of the Northern Hemisphere. It is powerful enough to command lip service from politicians but too weak to impose the policies it says are needed to prevent catastrophic change.

Many environmentalists fail to grasp that the real problem isn’t skepticism that the climate is changing, or even that human activity is a leading cause of the change. Millions worry about climate change and believe human activity is in large part responsible. But they do not believe that the climate movement has the answers for the problems it describes. Green policy blunders, like support for ethanol in the U.S. and knee-jerk opposition to nuclear power, erode confidence that environmental activists—who too often have an anticapitalist, Malthusian and technophobic view of the world—can be trusted, to as they often say, to “save the planet.”

For center-right politicians and people who support both free markets and a healthy environment, the status quo is also a problem. In the U.S. and abroad, market-friendly politicians cannot embrace the stagnant, statist and rent-seeking policies often proposed by environmentalists. Yet neither do they wish to turn a blind eye to a consequential problem that voters care about.