Why "Derth Day"? Because the adherents to environmentalism display a dreadful derth of:
openness to differing opinions
I recommend for your consideration the following video. While I regret George Carlin's profanity and his obvious lack of regard for man's immortal soul, I do think this clip of his puts the environmental nazi control freaks in their place.
The environmentalists are making a religion out of their pet cause because they want control of you and me.