"We all must realize that science is never 100% sure"

So yea, there's just as goos a chance that ice cream caused global warming. Here's how scientists get their conclusions...

They find some random peice of evidence. They don't know what the truth is so they start to makeup stories that fits. They try these stories out and see if it makes any sense. If it does, then it's science. If it doesn't they throw it away and move on. The 'truth' as we know it is just a story we've made up with the facts at hand. Change or add a fact and the story is changed. Give it a hundred years and we'll see where the story is at. Example case: The earth is flat...With all of the knowledge at hand, this made sense. Find out that you can go around in a circle to get places and the story has been changed.

Don't be so arragont that you beleive what you think is the truth. It's only your understanding of the truth.