The North Pole is melting.
The thick ice that has for ages covered the Arctic Ocean at the pole has turned to water, recent visitors there reported yesterday. At least for the time being, an ice-free patch of ocean about a mile wide has opened at the very top of the world, something that has presumably never before been seen by humans and is more evidence that global warming may be real and already affecting climate.
The last time scientists can be certain the pole was awash in water was more than 50 million years ago.
Here are some humans who saw it in 1959, which is less than 50 million years ago.