The funding target had already been agreed in principle at the last Convention on Biological Diversity (CBD) meeting in Hyderabad, India, in 2012, but there had been disagreement on how to calculate the increase.
The gathering in Pyeongchang, South Korea, agreed to use average annual biodiversity funding for the years 2006-2010 as a baseline to be doubled by 2015, and then maintained through 2020.
Governments also agreed to increase domestic financing for biodiversity projects.
In its Global Biodiversity Outlook issued at the start of the conference in Pyeongchang, the CBD made it clear that the world was not on track to meet the so-called "Aichi Targets" -- which include halving habitat loss, reducing pollution and overfishing, and putting a brake on species extinction.
"Parties have listened to the evidence, and have responded by committing themselves to redoubling their efforts ... including the financial resources needed to make this a reality," CBD Executive Secretary Braulio Ferreira de Souza Dias said Friday.
In its Outlook report, the CBD had warned that global rates of deforestation were still "alarmingly high" despite a slowdown in the depletion of the Brazilian Amazon and gains in forest coverage in Vietnam and China.
Habitats of all types, including forests, grasslands, wetlands and river systems, continue to be fragmented and degraded.
In one striking example of long-term degradation, the report cited a 20 percent reduction since 1980 in the populations of wild birds specialising in habitats such as grasslands and forests in North America and Europe.
The cost of inaction to halt biodiversity decline would give rise to increasing and cumulative economic annual losses of around USD 14 trillion by 2050, Steiner said.
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