To flood the air with carbon dioxide, the biospherians hauled back the tons of dried grass clippings they had removed earlier.The clippings were piled on the soil as mulch and wetted.

• 为了向空气中充入二氧化碳，生物圈人把成吨的修剪下来的干草拖回去弄湿，盖在地表作地膜。