Here's the top line argument. Our environment is a complex dynamic system, massive change over a short time period can have devastating effects. We only have on

Here's the top line argument. Our environment is a complex dynamic system, massive change over a short time period can have devastating effects. We only have one planet to live on, so we shouldn't gamble with it in this way. Put another way, you shouldn't walk around eating random substances you find because no one has proven to you that it won't cause harm.