What's the worse environmental hazard you've seen with your own eyes? I've seen a few. Though the worse was a lake I visited about once a day. We came once during winter (winter it's harder to get up there because it's too cold to take long walks and then school makes life busy.) I walked up there with my friend and we smelled dead fish, even a mile away. When we got to the lake, we counted over 345 dead fish. Now this lake wasn't that big, so that's a lot of fish. There was obviously oil in it by how it looked. We called our local "Stream Team" and they said it was just a turn over. I'm not sure if you all know what that is, but it comes from people spraying vitamins or w/e to make the grass grow better. It gets into the lake and causes a sheet of vegetation to grow over the lake. This takes the oxygen from the fish and wala, dying lake. That's not what happened, as there was no vegetation! Anyways, that's about the worse I've seen. Second worse would be when the sewage backed up into another lake near my home. It smelled terrible, and the fish were probably dying in there, and people still fished??!!! Anyways Yeah.