Global trends in bird species survival indicator: data sources and methods, chapter 1

1. Introduction

The Global Trends in Bird Species Survival indicator is a part of the Canadian Environmental Sustainability Indicators (CESI) program, which provides data and information to track performance on key environmental sustainability issues.

The Red List Index (RLI) measures the projected overall extinction risk of species by examining changes over time in species' classification on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. The steady and continuing deterioration in the threat status for many species, since the first global assessment was carried out in 1988, indicates that birds are facing increasing threats and risk of extinction, threatening bird biodiversity worldwide.^{Footnote [1]}