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Despite their political popularity, carbon tariffs will be next to impossible to implement effectively, and as such will do little to solve the climate problem.
In their efforts to make climate information more useful for adaptation decisions, scientists will need to be clear about the limits of climate prediction.
Humanity must learn to live within a stable Holocene environment, but the boundary limit for land use depends on more than the amount of surface covered.
For nitrogen deposition as for other pollution, waiting until we approach the limits of environmental degradation merely allows us to continue our bad habits until it's too late to change them.
Setting a limit on long-term atmospheric carbon dioxide concentrations merely distracts from the much more immediate challenge of limiting warming to 2 °C.
A boundary that expresses the probability of families of species disappearing over time would better reflect our potential impacts on the future of life on Earth.
An oft-forgotten source of food security and livelihoods, fisheries must be included in ongoing discussions of how the world’s most vulnerable can adapt to climate change.