Here are some of the links from todays lesson for you to look at in more detail:
World Population counter:
http://opr.princeton.edu/popclock/ OR
http://www.ibiblio.org/lunarbin/worldpop
Minature Earth
http://www.miniature-earth.com/
Statistics:
http://www.statistics.gov.uk/,
UN. http://hdr.undp.org/statistics/
Make Poverty History (yellow dress film)
http://www.makepovertyhistory.org/video/
These are mainly all for your own personal interest, but you may need the statistics from the UN occasionally.