You could always put your text into Microsoft Word and have it edit it for you. I have done that once or twice...
As for global warming, all of those can be factors in it. From our own pollution, to the fact we're coming out of a small ice age, the sun growing, earth cooling, deforestation, concrete, polluting water ways, there are many reasons for it. Most of them, we cannot do anything about. Pollution is blamed because it creates nasty hazes over cities (and countries) and people really don't like that. We create pollution, so we can stop it (well, not all of it of course). We as humans are hoping that if we engage a battle against pollution and wipe it out, the global warming will stop, the rivers/streams will fill back up, the icebergs will stop melting, etc.
There are other factors for pollution that stem from the earth itself, such as volcanic activity, earthquakes, it's nothing but chaos going on all over the place that changes this and that. Remember, the earth has been a lot hotter than it is now and a lot colder. We're lucky.
I watched something on the Discovery channel the other night m'self, said something about the icebergs being almost completely melted by the end of this century. Sounds like great fun, don't it? Countries are already fighting for the open water rights.
Man that would be pretty cool to see, aroura everywhere.
Ha, no. We'd be like those nasty black french fries at the bottom of the grease trap...probably worse. Yes, it'll be beautiful for a few minutes, until your eyeballs boil.