POPULAR SCIENCE - A giant spike in ocean temperatures about 93 million years ago may have helped sharks grow from stubby bottom dwellers into bigger predators. This surge in ocean heat in the Cretaceous period came from a gush of volcanic lava that sent carbon dioxide levels skyrocketing. This created a greenhouse effect that raised...
THE NEW YORK TIMES - It sounds like something out of a Hollywood film script, but it really happened: Shark-evolution researchers say that increased ocean temperatures more than 100 million years ago may have caused sharks to grow bigger, swim faster and become the powerful predators we know today. In a paper published last month...