I need to write an essay by the end of this month and it can be on anything to do with environmental physics, which i don't know too much about. any ideas would be appriciated, thanks. ps, i don't really want to write about global warming because most people wil be doing that, i want something unique, e.g. el nino affect on whale migration? (not sure what the el nino is either, something to do with the varying temperature of the water in the pacific, but whats so special about the temperature variation in that particular region anyway?) would comets/ meteor impacts on earth be under environmental physics? I could talk about that and its consequences, and chances, plus i could mention that new crater they found in antarctica which is very interesting.