"Drew Shindell" is an ozone specialist and professor at Duke University's Nicholas School. He was formerly a climatologist at the NASA Goddard Institute for Space Studies. His research is concerned with global climate change, climate variability, and atmospheric chemistry. He uses climate models to investigate chemical changes such as the ozone depletion/depletion of the ozone layer, climate changes such as global warming, and the connections between these two.

More Drew Shindell on Wikipedia.

It's fair to say that it probably is the warmest since we have modern meteorological records.

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.

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.

So in seven years, we've caught up with El Nino-like conditions.