This Week on the Colbert Report

MONDAY 9/10 -- Bjorn Lomborg -- author, "Cool It: The Skeptical Environmentalist's Guide To Global Warming"

TUESDAY 9/11 -- Garrison Keillor -- author, "Pontoon: A Novel of Lake Wobegon"

WEDNESDAY 9/12 -- Joel Klein -- NYC School Chancellor

THURSDAY 9/13 -- Ed Begley Jr. -- actor, leads totally green existence