By Elisa Jiménez Alonso
The UN Intergovernmental Panel on Climate Change (IPCC) has released a special landmark report on the impacts of 1.5 °C warming above pre-industrial levels. The report finds unprecedented changes would be necessary worldwide to keep warming below 1.5 °C but that it would massively decrease global climate risks.
The half-degree difference between 1.5 °C and 2 °C, the target range set out in the Paris Agreement during COP21, is a significant one. “Every extra bit of warming matters, especially since warming of 1.5°C or higher increases the risk associated with long-lasting or irreversible changes, such as the loss of some ecosystems,” Hans-Otto Pörtner said, who leads the working group on impacts and adaptation.
At the current rate of warming, we could reach the 1.5 °C target as early as 2030 and 2052. Keeping to that ambitious warming target would significantly lower the risks of droughts, floods, extreme heat and poverty for millions of people across the globe. For example, the proportion of the global population exposed to water stress would be 50% lower at 1.5 °C than at 2.0 °C.
Climate adaptation needs will be much lower at 1.5 °C, above it there are limits to adaptation and adaptive capacity for some human and natural systems, meaning losses would become inevitable.
However, keeping to that target and not exceeding it would require “rapid and far-reaching” transitions across all sectors and human carbon dioxide emissions would have to be reduced by 45% from 2010 levels by 2030, reaching net zero by 2050.
“We have presented governments with pretty hard choices. We have pointed out the enormous benefits of keeping to 1.5 °C, and also the unprecedented shift in energy systems and transport that would be needed to achieve that,” said Jim Skea, co-chair of the working group on mitigation. “We show it can be done within laws of physics and chemistry. Then the final tick box is political will. We cannot answer that. Only our audience can – and that is the governments that receive it.”
At the moment the world is on track for disastrous 3 °C warming. Amjad Abdulla, IPCC board member and chief negotiator for AOSIS (Alliance of Small Island States) said “the report shows that we only have the slimmest of opportunities remaining to avoid unthinkable damage to the climate system that supports life as we know it.”
Download the IPCC special report on global warming of 1.5 °C by clicking here.