New Delhi, Nov. 23 -- Some days ago, Bill Gates did the sort of thing that infuriates powerful activists. He said a doomsday was not coming.

He did this in a single detailed article on his blog Gatesnotes.com. He wrote that climate change is a very serious issue, even transformative, and that millions will be affected, especially the poor.

If he had just said all this, it would have looked like the text of any compassionate and alarmist climate warrior, but then he framed it in his new conviction that climate change is not the end of the world. It will not be as bad as we have been led to believe. Also, carbon emissions are coming down, and they may come down faster: ".with the right policies and investments, innovation will allow us to...