The level of ambition of the public and policy makers to protect the climate is currently far too low to slow the accelerating pace of climate impacts. Ambition can be strengthened using strategies that disaggregate the overall climate problem into manageable pieces, borrow existing laws and institutions to take fast action following a ‘start and strengthen’ approach. This is illustrated by the strategy to phase down the production and consumption of high global warming potential hydrofluorocarbons under the Montreal Protocol. Such an approach could cut the rate of global warming in half for the next several decades, and even more in the Arctic and other climate vulnerable regions. This can provide fast success and build the sense of urgent optimism needed to raise ambition to do more to address carbon dioxide emissions – the single largest contributor to climate change.
Issue of Our Planet, the magazine of the United Nations Environment Programme.
Current emissions of anthropogenic greenhouse gases (GHGs) have already committed the planet to an increase in average surface temperature by the end of the century that may be above the critical threshold for tipping elements of the climate system into abrupt change with potentially irreversible and unmanageable consequences. This would mean that the climate system is close to entering if not already within the zone of ‘‘dangerous anthropogenic interference’’ (DAI). Scientific and policy literature refers to the need for ‘‘early,’’ ‘‘urgent,’’ ‘‘rapid,’’ and ‘‘fast-action’’ mitigation to help avoid DAI and abrupt climate changes. We define ‘‘fast-action’’ to include regulatory measures that can begin within 2–3 years, be substantially implemented in 5–10 years, and produce a climate response within decades. We discuss strategies for short-lived non-CO2 GHGs and particles, where existing agree- ments can be used to accomplish mitigation objectives. Policy makers can amend the Montreal Protocol to phase down the production and consumption of hydrofluorocarbons (HFCs) with high global warming potential. Other fast-action strategies can reduce emissions of black carbon particles and precursor gases that lead to ozone formation in the lower atmosphere, and increase biosequestration, including through biochar. These and other fast- action strategies may reduce the risk of abrupt climate change in the next few decades by complementing cuts in CO2 emissions.
