If growth is good, lots of growth must be very good. If we like people, then lots of people must be good, right?
It took 123 years from 1804 to 1927 to add a billion people to the world's population.
It took 12 years to 2011 to add another billion, and now there are over 7.5 billion people on the planet.
Michaeal Bayliss from Sustainable Population Australia talks us through some reasons why we should care. But is that racist? Why not just recycle?
Music we play during the show are from his band Shock Octopus.
Interview by Rod and Tom

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