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What is your carbon footprint?

Where are the nation’s alternative-energy hotspots?

What is the relationship between the energy we use today and climate?

How do we do something about the trends in global warming?

How Do We Know It Is Not a Natural Cycle?

When scientists look at climate variations in the past, they don't see anything like today's warming.

What Is the Greenhouse Effect?

It's why global warming is happening, and why scientists are so worried about rising levels of carbon dioxide and other gases generated by agr…

Climbing levels of CO2 in the atmosphere are causing global warming

CO2 levels in the atmosphere help set the planet’s temperature

Fossil fuel use has driven the recent jump in atmospheric CO2

Carbon dioxide levels in the atmosphere are increasing