http://www.youtube.com/watch?v=8QKW6Gt3KKs
http://news.bbc.co.uk/2/hi/europe/8662822.stm
http://in.news.yahoo.com/43/20100503...earth-for.html
I also think Stephen Hawkings needs to settle down and stop pedaling his fear / catastrophism filth. Any advanced civilization capable of interstellar travel, would not NEED earth, they would've mastered resources too. I tend to think any aliens would be horrified by what they see us doing to each other on our own news channel. We would be cordoned off in a primitive 'enter at your own risk' sanctuary.
They would know exactly how the yanks or religious bodies would react. They are probably waiting for us to stop being so trigger happy.