Significant and possibly irreversible changes have already taken place.
However, rather than rushing headlong into irreversible changes, we should calmly reflect on the issues.
The risks of abrupt or irreversible changes increase as the magnitude of the warming increases.
If we continue down our current course, every member of this assembly will see irreversible changes within their borders.
"Irreversible changes in ecosystems could occur, causing massive emigration and greater conflicts," said the study commissioned by Bolivia's government.
It incorporates progressive irreversible changes in the succession of organisms through time.
The global sort is hard to pin down, but can involve irreversible changes.
We have to have a programme of long-term adaptation that enables the UK to cope with these fundamental and irreversible changes.
The world is at growing risk of "abrupt, unpredictable and potentially irreversible changes" because of a warming climate, America's premier scientific society warned on Tuesday.
The report, the work of more than 2,000 scientific experts, will warn that even a small amount of further warming could lead to "abrupt and irreversible changes".
"There is a risk of abrupt, unpredictable and potentially irreversible changes in the earth's climate system with massively disruptive impacts," the report said.
