The rate of global warming has doubled over the last decade. At this pace, we're on track to cross 2°C above pre-industrial temperatures within just 20 years.
Why does 2°C matter so much? Because past that point, the most severe consequences of climate change become effectively irreversible: the loss of Arctic sea ice, the collapse of ocean systems that regulate weather across the globe, and more frequent, more severe extreme weather events that devastate communities like San Diego. (3/4)