4. Declines in wildlife populations can act as an early warning indicator of increasing extinction risk and the potential loss of healthy ecosystems. When ecosystems are damaged they can become more vulnerable to tipping points - being pushed beyond a critical threshold resulting in substantial and potentially irreversible negative change.
Unless we change course, we risk passing tipping points of global significance which pose grave threats to humanity and most species. They include the decline of the Amazon, coral reef die-offs, the melting of Antarctic and Greenland ice sheets and the collapse of Atlantic ocean currents.