Humans have done some horrible things to the earth and they continue to do so. I like to think that the situation is getting a bit better overall. Gradually, we are realizing that we need to change some of the things we're doing. Just a a century or two ago people had a very different attitude toward natural resources. You can take hunting or fishing as an example. People just had no idea what populations were out there and how what they were doing affected it. Now most countries have some systems in place to protect animal and fish populations. Unfortunately, our forests are still being destroyed in many parts of the world, but I think eventually we'll get that under control too.