Final answer:
Agriculture surpasses the transportation sector in greenhouse gas emissions due to the significant production of methane from livestock and nitrous oxide from fertilizers, alongside deforestation for agricultural expansion which destroys carbon sinks.
Step-by-step explanation:
The agricultural industry's contribution to greenhouse gas emissions is significant and surpasses that of the transportation sector. This situation arises because agricultural practices produce substantial amounts of methane and nitrous oxide, alongside carbon dioxide. The production, transport, processing, storage, and disposal associated with food generate considerable emissions.
Furthermore, the destruction of natural carbon sinks, such as forests, to make way for agricultural land further accelerates greenhouse gas emissions. Transforming agricultural systems to act as carbon sinks, rather than sources, would help mitigate these effects.