At this time of year the temperature in the Arctic Sea should be around -25 °C. But this year it's been as mild -5 °C - and that's really worrying.
Sea ice builds up at this time of year, but at the moment it's growing at a slower rate than normal. Predictions suggest this November's volume of Arctic ice cover will be one of the lowest on record.
Everything in our climate is connected. If sea ice levels keep falling there will eventually be dramatic, global knock-on effects for everyone - wherever we are in the world.