Robust method predicts beginning of new climate in Arctic based on warming, wetting and sea ice loss / Arctic plant study reveals an 'early warning sign' of climate change upheaval / Arctic plant life shifts as warming drives major changes in biodiversity / Arctic winter ends with lowest sea ice cover in recorded history / Glaciers thawing restructures Arctic ecosystems -- scientists / Arctic hotspots study reveals areas of climate stress in Northern Alaska and Siberia / In pictures: Rapid thaw after Arctic weather / As Arctic climate warms, even Santa runs short of snow / Big shifts from tiny players: How climate change could disrupt Arctic ecosystems / Arctic climate change impact documented in Budapest photography exhibition