Blame humanity. Since record keeping began in 1880, we’ve never seen a year this warm. The difference is less than one degree Fahrenheit, but there’s only a 1 in 27 million chance this happened naturally. Especially considering that there was no El Nino to help push temps up last year. Scientists say it’s proof that global warming isn’t something to worry about for our children — it’s right here, right now. “Our entire idea of ‘normal’ is changing,” one says.