Sweden's Treeline much higher

"The tree line has moved by up to 200 metres (656 feet) in some places. Trees have not grown at such high levels for around 7,000 years," Leif Kullman, a professor at Umeaa University's department of ecology and environmental science, told AFP Tuesday.

The tree line represents a limit in mountainous, northern and southern latitudes beyond which trees do not grow.

That's a rather high climb in such a short period.