Climate scientists from University College London say strict limits on fossil fuels taken from the ground are needed to meet goals of the Paris Climate Agreement. Nearly 60% of the world’s oil and gas reserves and 90% of the coal reserves need to stay in the ground by 2050, they said, to give the world a 50-50 chance of limiting global warming to 1.5 degrees Celsius (2.7 degrees Fahrenheit) compared to pre-industrial times. Their study was published Wednesday in the journal Nature.