http://en.wikipedia.org/wiki/Drought_in_Australia Some members of the Australian environmental movement, notably the organisation Sustainable Population Australia, believe that as the driest inhabited continent, Australia cannot continue to sustain its current rate of population growth without becoming overpopulated. SPA also argues that climate change will lead to a deterioration of natural ecosystems through increased temperatures, extreme weather events and less rainfall in the southern part of the continent, thus reducing its capacity to sustain a large population even further. In response to this, there are several movements and campaigns around the country which are advocating for environmental action. One such campaign is "The Big Switch", claimed as Australia's largest community climate change campaign.  The UK-based Optimum Population Trust supports the view that Australia is overpopulated, and believes that to maintain the current standard of living in Australia, the optimum population is 10 million (rather than the present 20.86 million), or 21 million with a reduced standard of living. 10.86 million to many people living in Australia, well they can not move to the UK we are sinking in migrants.