Unless the international community agrees to cut carbon emissions by half over the next generation, climate change is likely to cause large-scale human and economic setbacks and irreversible ecological catastrophes, a United Nations report says on Tuesday. The U.N. Human Development Report issues one of the strongest warnings yet of the lasting impact of climate [...]

Here we have yet another extinction theory: It is the oldest telescope in the world – and it lies at the bottom of the ocean. Ancient sea floor sediments have revealed that a supernova exploded during the Pliocene era and may have caused a minor extinction event on Earth.