Something that cannot be changed back to its original state or condition.
From the prefix 'ir-' (not) combined with 'reversible' (capable of being reversed), from Latin 'reversus' meaning 'turned back.'
Climate scientists use the word 'irreversible' carefully—some changes to Earth's systems, like certain ice sheet collapses, may be irreversible even if we stop all emissions immediately, which is why prevention is so critical.
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