Environmental Science · Global and Planetary Change
A study examines how countries moved hydrofluorocarbon governance from the UN climate regime to the Montreal Protocol through the Kigali Amendment. It argues that the ozone treaty’s practical advantages helped states overcome initial objections that it lacked authority over these substances.
Long-running computer simulations found that different stratospheric aerosol injection strategies can lead to substantially different climate outcomes. Some strategies stopped the decline of the Atlantic Meridional Overturning Circulation, while another only slowed it, despite the simulations having the same temperature targets.
More efficient nitrogen management could improve air quality and reduce premature deaths while providing long-term climate and ecosystem benefits, according to simulations with two global climate models. The researchers also find a modest, temporary climate penalty before lower nitrous oxide emissions produce longer-term benefits.
A legal article argues that meeting the Paris Agreement targets alone does not discharge countries’ wider human rights obligations in the climate crisis. It maintains that general international law principles—such as preventing significant environmental harm—still apply alongside the climate treaty.
