Scientists warn seven of Earth's nine critical planetary boundaries have been crossed

Seven of Earth's nine critical planetary boundaries have been crossed, weakening the planet's ability to sustain life. Oceans, which absorb significant heat and carbon dioxide, have now passed a critical threshold due to acidification from absorbed CO2, harming marine ecosystems. Only the ozone layer and air pollution are considered within safe limits, with scientists warning that reversing trends for climate and biodiversity is urgent.