I hope the proposed treaty is effective, as ocean ecosystems are under increasing pressure.
Ocean-wide biomass declines projected due to climate change
Climate change will cause fish
biomass to decline 5 percent for every one degree Celsius of warming, according to the most comprehensive analysis of marine ecosystem models to date.
The decline in biomass will be more severe if humanity continues to emit high amounts of greenhouse gases, but even a certain amount of decline is already locked in under low emissions scenarios. If current
trends continue, marine biomass will decline 17 percent by 2100, while it will decline only 5 percent if humanity implements strong mitigation programs.
The study finds that it didn’t make a difference whether fishing pressure remains or disappears entirely
— the effect is driven entirely by the warming waters that are leading the oceans to be less-effective producers of life.
Study URL: https://www.pnas.org/content/116/26/12907
Impacts of historical warming on marine fisheries production
Climate change is altering habitats for marine fishes and invertebrates, but the net effect of these changes on potential food
production is unknown. We used temperature-dependent population models to measure the influence of warming on the productivity of 235 populations of 124 species in 38 ecoregions. Some populations responded significantly positively (n = 9 populations) and others responded significantly negatively (n = 19 populations) to warming, with the direction and magnitude of the response explained by ecoregion, taxonomy, life history
, and exploitation history
. Hindcasts indicate that the maximum sustainable yield of the evaluated populations decreased by 4.1% from 1930 to 2010, with five ecoregions experiencing losses of 15 to 35%. Outcomes of fisheries management—including long-term food
provisioning—will be improved by accounting for changing productivity in a warmer ocean.