Question

what is one reason why producing leather has a larger carbon footprint than growing mycelium?
mycelium requires more land to grow
leather production requires synthetic chemicals
leather production uses more electricity
cattle emit large amounts of methane during digestion

Explanation:

Leather production involves raising cattle. Cattle emit methane (a potent greenhouse gas) during digestion. Methane contributes significantly to carbon footprint. Mycelium - based materials do not involve such livestock - related methane emissions.

Answer:

Cattle emit large amounts of methane during digestion.