This video shows what acid rain is, what causes it, what is is doing to our environment, what will happen in the future, and possible solutions. This video put it into perspective better then reading it for me.
ALSO, listen carefully to the song playing!!!
Here are some tips and tricks for determining bond type without looking at the electro negativity values. If you have a periodic table, and I'll just draw a sketch. You don't have to draw it out of course. Then the periodic table looks more like this. And so pretty easy.