These concerns have been present with a certain number of people for a rather long time, and I've never been too sure how much to be concerned (although it seems like many people aren't concerned in the slightest).
Here's a couple of other (long) videos which you might be interested to see (if you haven't watched them already:
"Arithmetic, Population and Energy"
http://www.youtube.com/watch?v=umFnrvcS6AQ
"The Crash Course" (part 1 of a lot of videos, but worth a watch)
http://www.youtube.com/watch?v=XnXZzx9pAmQ