Oren Cass writes at National Review Online about the overheated reaction to President-elect Donald Trump’s likely rejection of climate alarmism.

Given the emotional reactions that Donald Trump and climate change each trigger separately, they offer an especially combustible combination.

Paul Krugman worries that Trump’s election “may have killed the planet.” Activist Bill McKibben calls Trump’s plan to reverse the Obama climate agenda by approving the Keystone XL pipeline and other fossil-fuel projects, repealing the Clean Power Plan, and withdrawing from the Paris agreement “the biggest, most against-the-odds, and most irrevocable bet any president has ever made about anything.” And let’s not forget “Zach,” the DNC staffer who reportedly stormed out of a post-election meeting upset that “I am going to die from climate change.”

A Trump presidency offers many reasonable reasons to worry. But the fear that he will kill the planet, or even poor Zach, is at least one anxiety we can dispel.

Just listen to President Obama. His administration developed a “Social Cost of Carbon” that attempts to quantify in economic terms the projected effects of climate change on everything from agriculture to public health to sea level, looking all the way out to the year 2100. So suppose President Trump not only reverses U.S. climate policy but ensures that the world permanently abandons efforts to mitigate greenhouse-gas emissions. How much less prosperous than today does the Obama administration estimate we will be by century’s end?

The world will be at least five times wealthier. Zach may even live to see it.

The Dynamic Integrated Climate-Economy (DICE) model, developed by William Nordhaus at Yale University, which has the highest climate costs of the Obama administration’s three models, estimates that global GDP in 2100 without climate change would be $510 trillion. That’s 575 percent higher than in 2015. The cost of climate change, the model estimates, will amount to almost 4 percent of GDP in that year. But the remaining GDP of $490 trillion is still 550 percent larger than today.