65 degrees North Latitude and the Cooling Trend since 2000 of Iceland - a Glacial Re-advance?

Iceland has been experiencing a negative linear trend in temperature since 2000.
Atmospheric Carbon Dioxide levels have risen throughout this period. How can this be explained?
What is causing this cooling across 65 degrees north latitude that can now be seen to be impacting not only Iceland, but also Greenland, and North America too from Alaska to Northwest Canada
Link to figures https://drive.google.com/file/d/1d1UF98KYhL-6U0wDYOSiFMO0nfsPSyyv/view?usp=share_link