"Governments gave the green light on Thursday for a U.N. scientific study on how to meet an ambitious global warming target, despite growing worries by some scientists that the goal may be unrealistic.

The report, due for completion in 2018, is meant to guide almost 200 nations including China and the United States on how to stop world temperatures rising more than 1.5 degrees Celsius (2.7 Fahrenheit). its' open ended - no date set

But some scientists say the 1.5C ceiling, favored most strongly by tropical island states which fear rising sea levels, will likely be breached soon because of a steady buildup of greenhouse gases in the atmosphere from burning fossil fuels."

Alister Doyle reports for Reuters October 20, 2016. [2]