Table 1. Explanatory factors used for the wetland conversion regression analysis.

	Explanatory factor	Description	Unit	Source
Biophysical factors	Temperature	Annual mean (mean of monthly mean).	°C	worldclim.org
	Precipitation	Annual mean (mean of monthly mean).	Mm	worldclim.org
	Slope	Derived from Altitude 30 sec map.	degrees	worldclim.org
	Organic content	Percentage of organic carbon.	% mass	FAO/IIASA/ISRIC/ISSCAS/JRC, [56]
	Histosol	Percentage of histosols.	Ratio (0-1)	FAO/IIASA/ISRIC/ISSCAS/JRC, [56]
	Wetland area	Percentage of wetlands within a 3x3 grid cell area.	Ratio (0-1)	Lehner and Döll, [27]
Socio-economic factors	Cropland cover	Average cropland cover within a 3x3 grid cell area.	Ratio (0-1)	Ramankutty et al., [57]
	Agricultural efficiency	Relative measure of land-use intensity.	Ratio (0-1)	Neumann et al., [23]
	Built-up area	Global urban land for c. 2001-2002 based on (MODIS) 500-m satellite data.	% of grid cell.	Schneider et al., [58]
	Population density	Average population density within a 3x3 grid cell area (year 2000).	Nr/km2	CIESIN/CIAT, [59]
	Distance to roads	Distance to nearest road	M	National Geospatial Intelligence Agency (NGA); VMAP0
	Market accessibility	Indicator for the accessibility to markets.	Ratio (0-1)	Verburg et al., [25]
	Market influence	Indicator for market influence.	$/person	Verburg et al., [25]
	Voice and accountability	Captures perceptions of the extent to which a country's citizens are able to participate in selecting their government, as well as freedom of expression, freedom of association, and a free media.	scaled (-2.5 - 2.5)	World Bank, [26]
	Regulatory quality	Captures perceptions of the ability of the government to formulate and implement sound policies and regulations that permit and promote private sector development.	scaled (-2.5 - 2.5)	World Bank, [26]
	Government effectiveness	Captures perceptions of the quality of public services, the quality of the civil service and the degree of its independence from political pressures, the quality of policy formulation and implementation, and the credibility of the government's commitment to such policies.	scaled (-2.5 - 2.5)	World Bank, [26]
	Rule of Law	Captures perceptions of the extent to which agents have confidence in and abide by the rules of society, and in particular the quality of contract enforcement, property rights, the police, and the courts, as well as the likelihood of crime and violence.	scaled (-2.5 - 2.5)	World Bank, [26]

All maps have global coverage and a resolution of 9.25 x 9.25 km in equal area Eckert IV projection (corresponding to 5 arcminutes at the equator).