Raffaele Bernardello
Established Researcher, Climate Variability and Change Group, Barcelona Supercomputing Center
This report explicitly acknowledges the inevitability of crossing the 1.5 C warming limit, set by the Paris agreement, within the next few years. At the same time, the report stresses how the duration and intensity of a so-called overshoot period must be limited to reduce risks of harm to humans, ecosystems, infrastructure and economies. Every fraction of a degree and every year above 1.5 C matters and both should be minimized. The report delineates three interconnected phases that should drive an overshoot peak and decline pathway. These are immediate response, coping and containment, and long-term resilience and they would coexist across regions and timescales. The report stresses the urgency of planning mitigation and adaptation as interconnected dimensions of the same problem rather than sequential stages.
The report sounds once again the alarm about the urgency of rapid action to reduce the most severe impacts of climate change and it provides a detailed account of what is required and what are the potential consequences of further delaying global coordinated action.