Global warming has really taken off since the 1970s. The warming in the past several decades has been more than it was the whole previous record, which is about 100 years before that. |
Instead of being this tiny player, (ozone) can be more like 30 or 40 or even 50 percent of the cause of warming that we're seeing in the Arctic now. It's very dramatic. |
It's basically all of the temperatures at the surface that we can get our hands on. |
It's fair to say that it probably is the warmest since we have modern meteorological records. |
So in seven years, we've caught up with El Nino-like conditions. |