Earth may have breached seven of nine planetary boundaries, health check shows

Ocean acidification close to critical threshold, say scientists, posing threat to marine ecosystems and global liveability

Industrial civilisation is close to breaching a seventh planetary boundary, and may already have crossed it, according to scientists who have compiled the latest report on the state of the world's life-support systems.

Ocean acidification is approaching a critical threshold", particularly in higher-latitude regions, says the latest report on planetary boundaries. The growing acidification poses an increasing threat to marine ecosystems."