Medio: sen karbono
La lando ne havas karbonon.
http://myscienceacademy.org/2016/03/23/this-country-isnt-just-carbon-neutral-its-carbon-negative/ angla
La lando ne havas karbonon.
http://myscienceacademy.org/2016/03/23/this-country-isnt-just-carbon-neutral-its-carbon-negative/ angla
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