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 ...

To call someone an animal is an insult, the quintessential “other”. At the same time, we humans covet their qualities.

In March, the ABC aired a story showing footage of pigs in Australian abattoirs being stunned with carbon dioxide before having their throats cut. Packed into small, gas-filled chambers, these animals ...