I believe in global warming, Bjorn Lomborg writes, but also in responsible policies to address it. That can get you in trouble.
Copenhagen Consensus research shows that policy makers considering climate change have practical solutions. Cutting fossil-fuel subsidies is a great idea. Each year $550 billion is wasted, mostly by developing nations, on subsidies that mainly help the rich. A dramatic increase in spending on green-energy R&D is needed, as innovation will drive down the price of green energy to the point that it can outcompete fossil fuels. A well-crafted carbon tax would help too.
But our analyses also show that Kyoto-style approaches—poorly designed EU climate policies, or the pledge to hold warming to two degrees Celsius—are costly and ineffective. There are much better ways we could spend money to help the planet.