Nature Climate Change, Published online: 10 February 2020; doi:10.1038/s41558-020-0696-1 Earth's energy imbalance from human and natural drivers—effective radiative forcing—is difficult to constrain, contributing to uncertainty in long-term climate change. A top-down observational constraint reduces IPCC AR5 assessed uncertainty by nearly 40% and suggests models are biased low.
Crucial climate talks due to be held this November have been postponed, but a short delay could give countries time to get better organised - and see Donald Trump replaced with someone who supports a climate deal
When Swedish teen climate activist Greta Thunberg skipped flying in favor of a two-week Atlantic crossing to reach the United Nations Climate Summit in New York in September 2019, the nascent flight-shaming movement really took off. Protest groups such as Greenpeace and Extinction Rebellion are fueling the campaign by highlighting aviation's role in global warming. The phenomenon could lead to lower passenger numbers, higher taxes on flights, and changes in jet and fuel technology.