Some misguided people, today, who may call themselves "pronatalist", and who look at future predictions of negative population growth (meaning that population will decrease in the future, instead of continuing to increase), and see this as a problem, are wrong or are not thinking clearly. Some of them may believe that African and Arab and Asian populations are in the process of "replacing" or at least are overtaking the Caucasian, European-based ethnicities that have traditionally been the majority of the population in countries like the US, the UK, Europe, Canada, Australia and New Zealand; and they are right - this is indeed happening, as is the Hispanicization of the US population because of such massive immigration. And they are right to be concerned about this. In a century there may be no nations left on Earth where Caucasians of European ancestry are the majority of the population if immigration is not stopped. And this is a problem. There will be African majority countries, Asian majority countries, Arab majority countries, Hispanic majority countries, but there will not be any Caucasian of European ancestry majority countries left if we do not take action now.

These apes can tell when humans don’t know something, study finds

[Nyota, one of three bonobos involved in the experiment]

Trees might not be acting in the way we thought - this forest fitted with pipes can tell us why

By simulating the future atmosphere, scientists hope to understand whether trees will continue to act as the lungs of the planet.

"The oak is the queen of her domain," says Rob MacKenzie as he gestures towards a giant towering above us. This oak tree has stood in this very spot since long before he or I walked the Earth. 

Chlamydia could make koalas extinct. Can a vaccine save them in time?

On the table, unconscious and stretched out on a pillow, Joe Mangy looks deceptively peaceful. The koala's watery, red-rimmed eyes are the only sign of the disease at war with his body.

Tubes snarl out of a mask covering his face as a vet tech listens to his chest with a stethoscope. He is not healing as well as they had hoped.