OK, so that was one guy's guess/simulation. The IPCC and the vast majority of scientists were and still are saying sometime in the mid to second half of 2100.
Here's some quotes from Maslowski....
" My statement you quoted and was printed in The New York Times of 2013, my first presentation where I actually had this projection stated exclusively was about 4 or 5 years ago in San Francisco, at American Geophysical Union poll meeting. So, I'm not actually upgrading my projection, I'm just saying that it may happen sooner but we were one of the early people who were saying that it might happen within the next decade, instead of by the end of this century."
", the multi-national climate simulation study have predicted the ice might be disappearing in summer, the northern summer in the Arctic, maybe sometime by the end of this 21st century.
There are some model simulations, single model simulations, that are suggesting that it could possibly occur as early as 2050 or maybe even as early as 2030."
http://beyondzeroemissions.org/medi...e-summer-arctic-five-years-ago-now-he-says-ma
This is an example of how news outlets grab on to the most sensational of stories and put it out there is if this is what all of science believes. When really they just want to sell papers. The same thing happened with the much hyped ice-age predictions which also was a minority and mostly unsupported opinion. The Guardian seems to have done this a lot. Then the deniers hold these up as if they should be some condemnation of the science as a whole.