~ Killing the Environment?! ~

So today when I woke up, my brother, Joe, and I had the job of cutting the trees on the side of our house. Well not really cutting them down completely, but trimming them because they were getting to be WAY too huge. Look at this diagram to better understand what I am going to talk about next

|ixH

| = a brick wall
i = boats
x = trees we had to cut
H = the side of my house


Next look at this picture:



Okay, now I am going to explain. Under the boat, coming out from the bottom, I saw a black plastic bag. At first I thought it was just a small piece of a bag, so I pulled it up. But no, it wasn't just a small piece, it was MUCH more than that. It covered the whole bottom of BOTH boats!!! I'm still trying to determine why it was there, any thoughts?