What would a global warming increase of 1.5C be like?

The Paris climate conference set the ambitious goal of finding ways to limit global warming to 1.5C, rather than the previous threshold of 2C. But what would be the difference? And how realistic is such a target? Environment 360 reports

How ambitious is the world? The Paris climate conference last December astounded many by pledging not just to keep warming "well below two degrees celsius," but also to "pursue efforts" to limit warming to 1.5C. That raised a hugely important question: What's the difference between a two-degree world and a 1.5-degree world?

Given we are already at one degree above pre-industrial levels, halting at 1.5C would look to be at least twice as hard as the two-degree option.