21.   Then, polar ice totally melted.

22.   He researched climate changes over thousands of years by analyzing air bubbles trapped in layers of polar ice in Greenland and Antarctica.

23.   Liljelund also warned that the Arctic is especially vulnerable to the effects of global warming, which could lead to melting of polar ice.

24.   Microbes have been found at the bottom of the ocean around volcanic vents, in polar ice and in boiling pools.

25.   Rising temperatures will melt polar ice which in turn will raise the sea level, and islands will perish.

26.   Scientists say that could lead to drought and flooding as weather patterns shift and polar ice melts.

27.   The largest looks like a partially buried golf ball lodged in the polar ice.

28.   The New York Air National Guard planes arrived in Christchurch, the gateway to the Antarctic for nations carrying out research projects on the polar ice.

29.   They said drought could strike farming areas, while melting polar ice could raise sea levels, flooding densely populated coastal areas of China, Egypt and other countries.

30.   They explained that the cyclical weather change had caused polar ice to melt in larger quantities, leading to higher tides than usual.