Speculative Or Science Fiction?

I still get people asking what speculative fiction is. Wiki puts it as a collective term for the fantastical genres of science fiction, fantasy, horror...works of unrestrained imagination. But I disagree because there's a more congruous meaning to it. The speculative fiction writer Margaret Atwood describes it as "a work that employs the means already to hand and that takes place on Planet Earth."In other words it is based on something real and speculates what could become of it. It is closer to reality than your typical sci-fi and fantasy. It is harmony between the fantastic and the plausible. Best of all it doesn't pigeonhole the writer into genres he or she can't get out of. In a way it's a sort of scenario planning, a lot of "what ifs", and I think plenty of good stuff is going to come out of it.