"There's now a big push to get nature into sovereign debt markets," said Simon Zadek, executive director at NatureFinance, which advises governments on debt-for-nature swaps and other types of climate-focused finance. At that level, it would be the biggest debt-for-nature swap struck to date. The combined value of swap deals to date is $3.7 billion, according to the data. Securing the buy-in of development banks is usually key for the economics of a deal. The WWF has projects in Central and South America where they are monitoring deforestation by tracking jaguars, said Brenes, who has worked on debt-for-nature swaps for the last 25 years.

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