In a little more than five years the world will likely be unable to stay below the temperature limit for global warming if it continues to burn fossil fuels at its current rate, a new study says. The study moves three years closer the date when the world will eventually hit a critical climate threshold, which is an increase of 1.5 degrees Celsius since the 1800s. Beyond that temperature increase, the risks of catastrophes increase. …The study in Monday’s journal Nature Climate Change calculates what’s referred to as the remaining “carbon budget,” which is how much fossil fuels the world can burn and still have a 50% chance of limiting warming to 1.5 degrees Celsius. …People should not misinterpret running out of the budget as the only time left to stop global warming, the authors said. Their study said the carbon budget with a 50% chance to keep warming below 2 degrees Celsius is 1220 billion metric tons, which is about 30 years.