7. Asparagus
Asparagus is one of the few vegetables with a heavy carbon footprint, costing a surprising 19.6 pounds of CO2 per pound. That, according to experts, has less to do with cultivation and more to do with the CO2 produced during transportation. Much of the asparagus eaten by Americans comes from South America and is flown from farm to store.
8. Avocados
Avocados may not produce much CO2, but their need for water is prodigious. When they’re grown in their native, tropical climates, the water they need comes naturally. However, when grown in drought-prone California (where most American-consumed avocados come from), the resources are much more scarce.