From an NBC press release:
NBC Entertainment programming, both scripted and unscripted, will adopt green-friendly and environmentally-oriented messages – across all dayparts – to promote the crucial issue of ecological awareness. Among NBC’s many programs to feature this content will be the entire Thursday night line-up, including the Emmy Award-winning comedy “The Office,” “My Name is Earl” and “30 Rock,” the hit drama “Heroes” and “Deal or No Deal.”
Shoot. That was a spoiler, wasn’t it?