The Stockholm International Peace Research Institute (SIPRI) recently published its latest information about military spending in the world. The total figure of global expenditure in 2012 was estimated to be 1745 Billion US Dollars.
The Economics of Ecosystems and Biodiversity (TEEB) for national and international policy makers, chapter 8, section 8.2.3 estimates that a global protected area network covering 15% of the land and 30% of the sea (not exactly Achi target 11, but close) would cost approximately US$ 45 billion per year, including effective management, compensation for direct costs, and payment of opportunity costs for acquiring new land.
The global protected area network would cost 2.6% of the global military expenditure. Moreover, TEEB estimates that the ecosystems within that network would deliver goods and services with a net annual value greater than US$ 4.4 trillion. The military expenditure just causes death.
World leaders should be ashamed.