The aggressive deforestation of this country's native birch trees in the Middle Ages, combined with its lack of sufficient agricultural reproduction, led Jared Diamond to examine it in Collapse. It has more land covered by (*) glaciers than the rest of Europe combined. This country's Pingvellir Natural Park includes an amphitheatre that hosted its first parliament, the Althing. Sitting atop the Mid-Atlantic Ridge, it gained the newly formed volcanic island of Surtsey in 1963. For 10 points, name this nation with capital at Reykjavik.