en.wikipedia.org
en.wikipedia.org
britannica.com
earth.org
nature.org
epa.gov
U.S. Environmental Protection Agency
https://www.epa.gov › ghgemissions › carbon-footprint-calculator
globalcitizen.org
conservationinstitute.org
scied.ucar.edu
Center for Science Education
https://scied.ucar.edu › learning-zone › climate-solutions › carbon-footprint
manglai.io
apaengineering.com
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