Warming Started Earlier

Research published in Nature concludes that anthropogenic climate change began about 180 years ago, well before modern weather records began. That implies we're a bit closer to the suggested 1.5 degree Celsius limit on temperature rise over pre-industrial levels.

Update (September 1):  Data from NASA show that the past 30 years have been quite unusual.

The planet is warming at a pace not experienced within the past 1,000 years, at least, making it “very unlikely” that the world will stay within a crucial temperature limit agreed by nations just last year.