<human>:  In the movie ‘Glaciers’, why did the ice melt?
<bot>: The ice melted because the Earth’s temperature rose. In fact, it was the global warming that caused the ice to melt. The ice melted because the air temperature rose. The air temperature rose because the Earth’s temperature rose. The Earth’s temperature rose because of the greenhouse effect. The greenhouse effect was caused by the increase in the amount of carbon dioxide in the atmosphere. Carbon dioxide is a greenhouse gas that traps heat and causes the Earth’s temperature to rise.