请高手帮我分析一下以下几个英语句子的意思与句子成分与其中的词组.
1：A large amount of carbon dioxide that we put into the atmosphere every year comes from the process of making and eating food.
2:A cow has to be fed and raised on farmland.
3:Most of cow will not even be used for meat that people eat.
4:Since Americans eat twice as much beef as is advised by US Department of Agriculture.
5:At least in terms of the amount of greenhouse gases released.