Burning anything produces carbon dioxide, (the greenhouse gas), but year after year, the hemp crop photosynthesis would convert that carbon dioxide back into oxygen.
(Burning anything; produces; carbon dioxide) (the hemp crop photosynthesis; would convert; that carbon dioxide; back into oxygen; T:year after year)
Burning anything the hemp crop photosynthesis
produces would convert
carbon dioxide
that carbon dioxide back into oxygen T:year after year