The veteran broadcaster and naturalist appealed to political and business leaders to work together to protect the planet.
There are around 21 billion broiler chickens in existence—far outranking all other bird species.
It has chronicled humanity's nuclear domination.
It's tricky to redefine what citizenship means in an era such as ours.
New research links the start of the "era of us" to the arrival of Europeans and the globalization of disease.
Within this century, climate change will bring "megadroughts" that will rival any drought seen for the past 1,000 years.
Five times in the history of the Earth, mass extinction events have wiped out the vast majority of life. Now it appears to be happening again