EDITOR’S NOTE: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...

A groundbreaking vaccine has been approved in Australia to combat chlamydia in koalas, a disease causing significant infertility and mortality in the endangered species. Developed by the University of ...

Koalas are an endangered species. This was not always the case, as the wild, adorable marsupials were once widespread across the Australian continent. However, over the last two centuries, ...

A regulator has approved a world-first vaccine to protect koalas from chlamydia infections, which are causing infertility and death in the iconic native species that is listed as endangered in parts ...