Sustainable Population Australia (SPA) was formed in 1988 by people who felt that the issue of human population numbers was overlooked, or regarded as too contentious, by many of those striving to preserve Australia's ecological heritage.

We are an ecological group dedicated to preserving species' habitats globally and in Australia from the degradation caused by human population growth. SPA works on many fronts to encourage informed public debate about how Australia and the world can achieve an ecologically sustainable population.

http://www.population.org.au/