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What is your carbon footprint? | Carbon Footprint Calculator
Carbon Footprint Calculator | Climate Change | US EPA
How to Calculate Your Carbon Footprint - PCMag
What's Your Carbon Footprint? - Center for Science Education
Carbon footprint | Definition, Examples, Calculation, Effects,
The 35 Easiest Ways to Reduce Your Carbon Footprint
WWF Footprint Calculator
What is a carbon footprint—and how to measure yours
CoolClimate Calculator
Household Carbon Footprint Calculator | US EPA - U.S.