I don't know much about this topic. I have not made a study of it. But I know that my gardening show guy in Cincinnati, Denny McKeown, seems to have made such a study.
And this whole thing makes him absolutely livid. In fact, it seems like he goes off at least once during his weekly radio show.
There I am, almost every Saturday morning, just waking up, I flip on the radio to hear about knockout roses and what kind of trees to plant and why my poor hibiscus did not do so well. And one time I even called him up and we chatted away about my ninebark. And he made me feel so much better about it.
And although he is still quite wonderful and I do not plan to give him up, I just know that he is going to blow up over global warming. Something triggers it and off he goes. And he rants for awhile and then he calms down and gets back to smelling the roses. Hey, it's his show.
Anyway, this link is to his website. You can ignore most of it because why would you care about what to plant in Cincinnati. But if you look right in the middle of the opening page, you will find a section titled "What's All the Buzz about Global Warming?"
I think some of you will get along just fine with Denny so here he is. -- just look right in the middle of his opening page and you will find him on his soapbox. Hey, it's his website.
http://www.bloomingarden.com/
Boomer