Human population growth - plot graph of U.N. data and answer questions

This is a graph drawing task with irregular time intervals. I find it best to do this at the start of a lesson on Human population growth. This leads on to discussions about waste management and pollution. If you ‘google’ world population you get a counter showing changing population in ‘real’ time. I have this running on my screen throughout the lesson. Note down number at the start and end of lesson to get a feel for the scale of this.