Feds offer $50,000 reward in apparent firing of gun at agents after clash with protesters

Around 250 million years ago, Earth was near-lifeless and locked in a hothouse state. Now scientists know why

## Ancient Earth's Extreme Heat Explained by ScientistsResearchers have finally pinpointed the cause of Earth's dramatic shift to a near-lifeless, scorching hothouse roughly 250 million years ago. This period, known as the Permian-Triassic extinction event, wiped out an estimated 96% of marine species and 70% of terrestrial vertebrate life.