abcnews goes green

Tonight’s reporting from World News Tonight

* Concern Soars About Global Warming as World’s Top Environmental Threat
* How to Address Global Warming: A Range of Tips
* EPA Carbon Footprint Guidelines
* San Francisco Goes Green
* Shrinking Your Carbon Footprint
* Fixing the Planet for Profit
* Limit Your Impact on the Environment
* Check Your Household’s Carbon Footprint
* Reducing Your Carbon Footprint

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