carbon-neutral
US /ˌkɑːr.bənˈnuː.trəl/
UK /ˌkɑːr.bənˈnuː.trəl/

1.
making no net release of carbon dioxide to the atmosphere, especially as a result of carbon offsetting or by reducing carbon emissions
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The company aims to be carbon-neutral by 2030.
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Building a carbon-neutral home involves using renewable energy sources.