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An Ice Age is a period of geologic time in which the Earth’s climate sees a dramatic drop in temperatures. This drop often is followed by larger ice fields in the Polar Regions. However even this basic definition does not fully explain what is an Ice Age. Ice Age while scientific is a blanket term for different types of glacial periods.

Global warming is an increase in the earth's atmospheric and oceanic temperatures widely predicted to occur due to an increase in the greenhouse effect resulting especially from pollution

Due to the effect greenhouse gases, the temperature of the earth’s surfaces increased is called global warming. Water vapor, carbon dioxide etc are the examples for the green house gases. And ice age is the period of long-term reduction in the temperature of the Earth's surface and atmosphere, resulting in the presence or expansion of continental ice sheets, polar ice sheets and alpine glaciers.

Global Warming: Average temperatures globally trend higher. Retreat of Glaciers. Higher rates of evaporation from bodies of water. Agricultural belts expand and migrate to the poles. Growing seasons lengthen. Bio-diversity has historically expanded and grown.

Ice Age: Average Global temperatures trend lower. Glaciers expand and grow. Large amounts of water get trapped in glaciers on land masses. Sea levels drop by 100's of feet (long time for this level of drop to occur) Agricultural belts shrinking and move towards the equatorial region. Bio-diversity can collapse. Growing seasons get significantly shorter. Less food for people and animal life.

10 to 15°C between ice ages (last ended 12,000 years ago) and interglacials.

http://en.wikipedia.org/wiki/File:Ice_Ag...

Compare to 0.8°C between little ice age (ended 19° century) and ongoing industrial warming.

global warming will lead to ice age . ...

none , one leads to the other

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