Over the last decade, climate change has accelerated the melting of Antarctic ice sheets and Arctic glaciers faster than predicted. The Arctic ice cap reached a record low in 2007 and climate models predict the region could be ice-free in summer within the next decade. An ice-free Arctic could impact weather patterns in the Northern Hemisphere and threaten polar bears that rely on sea ice. Climate change is also exacerbated droughts and causing vegetation shifts, affecting plant competition and wildlife. Melting ice, drought, and earlier springs are signs that global warming is already affecting the planet.