Reuters: Top climate scientists will launch a study this week of how hard it would be to limit global warming to 1.5 degrees Celsius (2.7 Fahrenheit), although many of them fear it might be too late to reach that level.
The world's average surface temperatures reached 1C (1.8F) above pre-industrial times in a record-hot 2015. They will rise by 3C (3.6F) or more by 2100 if current trends continue, many projections show.
A 195-nation climate summit in Paris in December asked the U.N.'s Intergovernmental...