The numbers are in, and scientists can now confirm what month after month of extraordinary heat worldwide began signalling long ago. Last year was Earth's warmest by far in a century and a half. Global temperatures started blowing past records midyear and didn't stop. First, June was the planet's warmest June on record. Then, July was the warmest July. And so on, all the way through December. Averaged across last year, temperatures worldwide were 1.48C, higher than they were in the second half of the 19th century, the European Union climate monitor announced Tuesday.
