And as such, previous efforts to reduce methane emissions focused on changing their diets or improving forage quality.

正因如此，之前试图减少甲烷排放量的工作主要关注改变牛的食谱，或者提高饲料质量。

The research team used NASA's MODIS satellite to take snapshots of the greenery over time while an onboard spectrometer analyzed the forage quality.

研究小组使用 NASA 的 MODIS 卫星随时间拍摄绿色植物的快照，同时机载光谱仪分析草料质量。