oh also "gobal warming" and "climate change" they are interchangeable, right?
Probably climate change is a better term. Global warming has become a little jingoistic, and loss some of its reputability. Climate change is more apt, because changes in the atmosphere can cause weather pattern shifts, causing heavy snows, or desertification, or heavy rains, none of which are "warming." Problem is, climate change lacks the word "global", lessening its impact. But anyway, if you want to avoid buzzwords in science, maybe that's not such a bad thing, so long as the message gets across.
Science is published by the American Association for the Advancement of Science, and is more popular in the US.
Nature is published by the Nature Publishing Group in the UK, and is more popular in Europe. I'd heard, the publications have something of a bias towards who they'll accept articles from, and so scientist on each side of the pond seem to extend the bias back towards the journal in question. Funny, I don't often read PNAS, I always reach for
Science or
Nature first. Silly of me to have that sort of bias, myself.