Arctic sea ice predictions

There is huge uncertainty among scientists when the Arctic sea is going to be ice free in the September low minimum.
Some models predict this century while others may suggest it will be closer to next century.
There are some predictions that it may even be this summer since we already know that 2017 will go down as the lowest year of sea ice on record, after 2015 and 2016.

People have been wondering why we have suddenly a 30 degrees temperature difference in a week but perhaps the temperature we experience now is the normal and the extreme cold was a temporary event caused by colder ocean current coming in fed by more fresh cold water.
The Arctic Ocean is  slow to react to forces coming in but once set in motion it is difficult to stop it.

According to scientists the CO2 we put in the atmosphere will have a direct effect on the Arctic melt.
“We can directly estimate that the remainder of Arctic summer sea ice will be lost for roughly an additional 1000 Gt of CO2 emissions based on the observed sensitivity of 3.0 ± 0.3 m2 September sea-ice loss per ton of anthropogenic CO2 emissions” according to the University of Colorado.
“Since this estimate is based on the 30-year running mean of monthly averages, it is a very conservative estimate of the cumulative emissions at which the annual minimum sea-ice area drops below 1 million km2 for the first time” but models still vary as to when the certainty of when this is -  around 20 years as to the first year of a near-complete loss of Arctic sea ice.

For current emissions of 35 Gt CO2 per year, the limit of 1000 Gt will be reached before mid century.
On the other hand if any measures are taken to mitigate CO2 emissions, it  will  directly and immediately  slow down the ongoing loss of Arctic summer sea ice.
“In particular, for cumulative future total emissions compatible with reaching a 1.5°C global warming target, i.e., for cumulative future emissions significantly below 1000 Gt, Arctic summer sea ice has a chance of long-term survival at least in some parts of the Arctic Ocean”.