What’s in a number? The significance of the 1.5°C warming threshold and reporting on its possible breach in popular media

1.5 is an important number in climate science. It is the recommended target, in degrees Celsius, to which global warming should be limited relative to preindustrial levels, according to the Intergovernmental Panel on Climate Change (IPCC), the world’s leading authority on climate science[1]. Further, the legally binding Paris Agreement tasks its global signatories to limit warming to “well below 2°C above preindustrial levels” and “pursu[e] efforts to limit the temperature, Read More