A new paper indicates that impacts on natural World Heritage sites from invasive alien species, such as house mice, Argentine ants and rainbow trout, may be greater than previously assessed.
IUCN Guidelines for assessors and reviewers on undertaking Conservation Outlook Assessments
Conservation Outlook Assessment worksheets for the IUCN World Heritage Outlook 2020 update
As the global conservation community rallies around a common ambition – to assess the level of achievement of Aichi Targets and define the post-2020 agenda for biodiversity – the IUCN World Heritage Outlook emerges as a useful indicator of the effectiveness of protected areas.
The International Union for Conservation of Nature (IUCN) is gathering input from experts around the globe to complete a new cycle of assessments for the IUCN World Heritage Outlook 3. This flagship IUCN report on natural World Heritage will be published in 2020, together with assessments for some 250 natural World Heritage sites.

More information on detailed ecosystem services analysis tools can be found in steps 2, 3 and 4 on the decision tree page.

Calculate or estimate the monetary value of ecosystem services

Identify ecosystem services, their condition, importance and trends