Imagine there’s a super-rich alien living on a nearby planet. It runs a business that involves making and launching hi-tech ...

Brown and colleagues raise the interesting question: what is the carrying capacity of the Earth's resources, especially the biological resources? Biologists and agriculturalists have long been able to ...

"Our behavior with greenhouse gases here on Earth over the past 100 years is having an effect on how we operate satellites over the next 100 years." ...