An extraterrestrial impact likely caused the dinosaur extinction 65 million years ago. Did a comet strike 10 million years later cause a global warming?
Lamnid sharks and tuna have similar physical traits that make them top ocean predators. But, a new study says, they took very different evolutionary paths.
“Sea ice really is their platform for life. They are capable of existing on land for part of the year, but the sea ice is where they obtain their main prey.”
Summertime sea ice in the Arctic reached a minimum on September 10 (unless it goes lower still). It's now tied for the second-lowest minimum in the satellite era.
Satellite images of the crack in Antarctica's Larsen C ice shelf. If it breaks off, it'll make an ice island in the Southern Ocean as large as one of the smallest U.S. states.