联合国环境规划署：更便宜、更清洁、不可阻挡：为气候助力的清洁技术（2026）（英文版）（28页）.pdf

1、1|UNEP|Positive tipping points for climate actionCheaper.Cleaner.Unstoppable.Clean technologies that are delivering for the climate1.Positive tipping points and their strategic potential1Climate impacts are intensifying,and global temperatures are likely to exceed 1.5 degrees Celsius(C)within the ne

2、xt decade(United Nations Environment Programme UNEP 2025a).Delivering on the Paris Agreement will require immediate action to reduce greenhouse gas emissions.In doing so,we can limit peak warming.Recent trends indicate that many low-carbon technologies and behaviours are no longer just emerging.Acro

3、ss energy,transport,buildings,and food systems,several low-carbon technologies and practices are approaching,and in some cases have already crossed,critical thresholds at which adoption can accelerate rapidly and become increasingly self-reinforcing.1 While this Policy Brief focuses on positive tren

4、ds,it draws on the same logics and phenomena of“negative climate tipping points,”which are critical thresholds in the Earths biophysical systems beyond which small additional warming can trigger self-reinforcing,potentially irreversible changes.These include ice-sheet collapse,coral reef dieback,and

5、 disruption of ocean circulation with severe global consequences for ecosystems and human societies(Lenton et al.,2025a).While the concept draws on analogies with Earth system tipping points,positive tipping points in socio-technical systems are not inevitable or irreversible,but remain contingent o

6、n sustained policy support,investment and enabling conditions.POLICY BRIEF2|UNEP|Positive tipping points for climate actionThese“positive tipping points”arise when reinforcing feedback,including declining costs,infrastructure expansion,policy support and shifting market expectations,drive nonlinear