I've had to for pragmatic reasons. I don't believe it's a hoax per se yet not entirely without some tarnishing. Nevertheless, I believe the results that a large community belief in global warming-as-happening-just-as-they-say will LEAD TO are pragmatic enough to stand behind "as if" true. Is it dishonesty from my part? Likely. But I believe in the ends, even if the means are a little off.