(1) As for global warming is caused by humans or not, I've always perceived the Democratic position to be less an "article of faith" and more an "there's a lot of research to support it, so let's err on the side of caution and act as if it's human-caused." The consequences are so immense, prudence would appear to be the safer course.

(2) As for gays, like Lowell said, I've yet to see any great umbrage at the notion. If anything, anecdotal evidence strongly points to a biological factor - as with twin studies. Also, a biological basis would buttress legal arguments for gay equality.

(3) Race is a social construct. For scientists to research "differences," they would first need some quantifiable differentiating factor. I am "Black;" however, within the last four generations of my family, I have, in addition to my African ancestry, two Native American tribes, Irish, French, and English forebears. And I am not unusual among "Blacks." Moreover, what is "White?" Does it matter what percentage is Irish or French Huguenot or Italian or Lebanese? And so on...