To the extent it actually addresses issues at all, the third and final presidential debate between Hillary Clinton and Donald Trump on Wednesday night is expected to cover “debt and entitlements,” immigration, the economy, the Supreme Court, “foreign hot spots,” and “fitness to be president.”

This list, chosen by moderator Chris Wallace and announced last week by the Commission on Presidential Debates, is notable for what’s not on it: namely, for many environmentalists, the critical matter of climate change, which has gotten the short shrift thus far.

“So far, the issue has tallied up two mentions,” Clark Mindock wrote Wednesday at International Business Times. “First, during the first debate when Clinton brought it up and accused Trump of calling the phenomenon a hoax (Trump denied the claim on stage but had actually said that in the past). The second mention came in the second debate when red sweater-adorned Ken Bone asked about coal policies. Moderators, notably, haven’t touched the subject yet.”

Kerry Emanuel, a leading climate scientist, mused to the Guardian about the omission of what he called “the great issue of our time.”

“It’s like a sort of collective cowardice,” he said. “It really is fiddling while the world burns.”

Noting that several of the topics on the docket for Wednesday night “have been amply covered in previous debates,” the Bloomberg editorial board said of the absence of climate change: