“Climate aid” is the latest fad among rich countries as they shift billions of dollars of foreign assistance away from health and nutrition programs and into carbon reduction. “In a world in which malnourishment continues to claim at least 1.4 million children’s lives each year, 1.2 billion people live in extreme poverty, and 2.6 billion lack clean drinking water and sanitation, this growing emphasis on climate aid is immoral,” writes Bjorn Lomborg in today’s Journal.

Not surprisingly, the people who need help didn’t ask for...