Willingness to pay for conserving biodiversity
The following is a visualization of countries’ willingness to pay for conserving biodiversity, measured in the percentage of domestic spending allocated to this aim relative to the Gross Domestic Product (GDP).
The figures of the domestic expenditure destined to conserving biodiversity were extracted form Waldron et al. (2013) [1]. The authors define domestic expenditure as all national spending on conservation based solely on government biodiversity conservation budgets, state environmental funds, and self-funding mechanisms like entrance fees in protected areas. Other sources of international funding such as donor-capitalized trust funds and debt for nature swaps were not taken into account.
According to the authors, domestic spending accounted for approximately 90% of total annual funding worldwide during the period 2001-2008.
Total GDP per country and GDP per capita were extracted from the World Bank database [2].
Map 1. Colours indicate the mean annual funding allocated to biodiversity conservation, in millions of US 2005 dollars, for the period 2001-2008. Circles indicate the size of the average GDP per capita for the period 2001-2008. 
Map 2. Colours indicate the percentiles of the mean country GDP for the period 2001-2008. Circles indicate the percentage of the average country GDP allocated to conserving biodiversity during the period 2001-2008. Absent circles indicate missing data on domestic expenditure.
References
1. Waldron, A., A. O. Mooers, D. C. Miller, N. Nibbelink, D. Redding, T. S. Kuhn, J. T. Roberts, and J. L. Gittleman. “Targeting Global Conservation Funding to Limit Immediate Biodiversity Declines.” Proceedings of the National Academy of Sciences 110.29 (2013): 12144-2148. Web.
2. World DataBank.The World Bank DataBank. World Bank. Web. 23 July 2014. http://databank.worldbank.org/data/views/reports/tableview.aspx?isshared=true