Ocean acidification crosses "planetary boundaries"

A study found that ocean acidification—the process in which the world’s oceans absorb excess carbon dioxide from the atmosphere, becoming more acidic—crossed a “planetary boundary” five years ago.

Humanity deep in the danger zone of planetary boundaries

Six of nine planetary boundaries—climate change, deforestation, biodiversity loss, synthetic chemicals including plastics, freshwater depletion, and nitrogen use—are already deep in the red zone, an international team of 29 scientists reported.