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and  Are You a Real  Techie? Giveaway       Power of 50  Earth
Facts, Tips and Advice  Do your part in protecting it    • Text
• Print   • Comments   • Recommend  Earth Day reminds us to
appreciate our global home, to assess its health and how it is
changing — then consider simple ways to protect it. Here is a
50-point tour of Earth facts, tips and advice.    power of 50  —
Jana Leon/Getty Images  Our Stomping Grounds 1. The planet is
4.5 billion years old. 2. Global warming followed each of
several ice ages starting in the Precambrian time more than 600
million years ago. 3. 1.75 million years ago, ice covered all of
Europe and most of North America. 4. 18,000 years ago, winter
temperatures were 27 to 36 degrees cooler. Ice Age Florida was
like Quebec. 5. As th