Are there more dead or alive?

Now that the world's population has past 7 billion, experts at the world population bureau have attempted to estimate if there are more people alive today, than have died since humans starting walking the earth. The start point taken was 50,000 years ago. Wendy Baldwin from the World Population Bureau said that this posed a problem because for 99% of human history, no record were kept, so they were relying on estimates. In their research the World Population Bureau believed that previous estimates had underestimated the number of births and deaths and that the ration of living to dead is actually 1 to 30.

http://www.bbc.co.uk/news/magazine-16870579