This is a nifty short video on population growth that's fast-moving and interesting and blessedly doesn't stray into politics or alarmism, though it does make some points that ought to provoke some sober thought. Some might find it a little too breezy or self-consciously amusing, but I enjoyed it.
On the video's YouTube page you'll find more information, including links to more videos from the same folks.
(Incidentally, slightly off-topic: If you want to send somebody a link to a YouTube video, the best way to do it is to click on the Share button below the video, which will give you a much shorter link than what's in your browser's address bar.)by