Global warming may not have ended Ice-Age, says research
Scientists at the University of Sheffield have used fossilised leaves to determine the effect of greenhouse gases on the end of the Ice Age 300m years ago, according to an article published in PNAS. The study, led by Professor David Beerling, examined fossilised leaves to determine how much carbon dioxide was in the air at various periods during the ice age. Leaves have pores on their surface called stomata that act as “air holes” and open and close depending on the levels of carbon dioxide in the air. The stomata are wider when there is little carbon dioxide to allow the plants to take in enough carbon dioxide to live. Also, leaves that live in areas with low levels of carbon d