I just happened upon this video. Although her numbers are conservative, I tend to agree with her.
https://www.youtube.com/watch?v=tefnGKQhjiM&list=TLNMn1TVyUQANXDSDoAQyUhprM34hX7ViE#aid=P-XsQpxgqVY
https://www.youtube.com/watch?v=tefnGKQhjiM&list=TLNMn1TVyUQANXDSDoAQyUhprM34hX7ViE#aid=P-XsQpxgqVY