A tipping point we don't want

I imagine many of us have read Malcolm Gladwell's The Tipping Point: How Little Things Can Make a Big Difference.

Now there's word that we may have reached a tipping point regarding climate in the northern hemisphere. That could affect major cities in a number of countries, so it's said.

As is often the case, Wikipedia seems to offer good background on the situation.

To repeat a link from three days ago, How Many Experts Do We Need Before We Heed Earth's Warnings? I guess the answer is that insurers are beginning to heed them now.

climate change
tipping point