Man-made climate change could turn Antarctica green, with plants colonising the land as ice sheets shrink, scientists have warned.

Experts believe clues about the future of the planet can be gleaned from the Pliocene period three million years ago, the last time carbon dioxide levels in the atmosphere were as high as they a "The consequences of what we have done over 150 years will continue into the future, so it's up to us to do something,” Prof Siegert said. “We will be judged in history on how well we respond to this issue, and at the moment we're not doing a very good job.”