Question

cattle eat a large amount of plants, which causes them to release large amounts of methane. why is releasing methane a problem?
it is a greenhouse gas.
it is not a problem.

Explanation:

Methane is a greenhouse gas. Greenhouse gases trap heat in the Earth's atmosphere, contributing to global warming and climate change. So releasing large amounts of methane, like from cattle, is a problem because it's a greenhouse gas.

Answer:

It is a greenhouse gas.