Mild January

The nation's warm January was the result of the <a class="taxInlineTagLink" id="PLGEOREG000026" title="Pacific Ocean" href="/topic/intl/pacific-ocean-PLGEOREG000026.topic">Pacific ocean</a>-warming phenomenon known as El Nino
sns-green-warmest-jan-picture

( Liu Jin/AFP/Getty Images )

The nation's warm January was the result of the Pacific ocean-warming phenomenon known as El Nino

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The 20 most-visited national parks in the U.S.
The 20 most-visited national parks in the U.S.
Calculate your savings when you replace standard light bulbs
CALCULATOR: Your green light to savings
Check out this quick and easy calculator. It'll help you estimate how much money and carbon dioxide you'll save when you replace standard light bulbs with compact fluorescent light bulbs.

Seeing Green