I'm fairly certain that we have several times more people alive than are dead. (Maybe a year ago, a teacher of mine also told me this)
The birth rate is constantly increasing. The death rate is also, but the birth rate's growth exceeds it.
I can't verify this from a source, but a few friends and I recently had a conversation about this. Two statistics came up, after research two of them had done:
- "Every second, someone dies."
- "Every second, 1.2 people are born."
Hope that helps