Global wildlife populations have fallen by two-thirds in 50 years, while some Australian animal populations have been almost entirely wiped out.
Deforestation, illegal wildlife trade and unsustainable agriculture are the main causes for the crisis and are also contributing to the emergence of zoonotic diseases like COVID-19, according to the long-running Living Planet report from World Wide Fund For Nature.
https://www.smh.com.au/environment/conservation/a-wake-up-call-world-wildlife-populations-in-heavy-decline-20200910-p55u93.html