The Earth, climate scientists worry, may be reaching a tipping point, especially as the Trump administration works to roll ...

According to a new study, we'll soon cross a point of no return after which it'll be almost impossible to avoid 2 degrees Celsius of warming. That's often considered a threshold for catastrophe.

Dear EarthTalk: What is the best way to measure how close we are to the dreaded "point of no return" with climate change? In other words, when do we think we will have gone too far? — David ...