Rough sketch of my symbol

Here are some of my rough sketch for my global warming symbol.Sorry for the bad quality of the pic.. >.<

This is the first sketch of my symbol..
As u can see here i'm using an earth for my symbol..i guess we're not suggested to the earth thing..so i wont be using this one.

And this is the second one..for this one i sketch a tree n a land n cover it all in 1 circle..and i hope u can see that the circle is filled up with water...

And this is the 3rd sketch..It's only da same..i just changed a bit on the shape covering the land..it's a waterdrop shape..This will be my final sketch and i'll be working on this symbol.