> Just growing plants and letting them die is purely carbon neutral. Actually, no. Depending on the plants and circumstances, it can be carbon-(equivalent)-pos

> Just growing plants and letting them die is purely carbon neutral. Actually, no. Depending on the plants and circumstances, it can be carbon-(equivalent)-positive because rotting plant material exudes methane, which has a far higher global warming potential than CO₂. So even with simple plant agriculture you can harm the climate, e.g. wet rice production.