or rotated with soybeans in the United States,

在美国占耕地面积的82%
82% vast acreages; fertilizer is applied to 98% of corn;

98%的玉米施用过化肥
insecticides are applied in 97% of corn acreages;

97%的玉米耕种区喷洒过杀虫剂
of all the herbicides 55% go to corn

55%的除草剂和44%的杀虫剂
and of all insecticides 44% are used for corn.

都施用于玉米
The corn production in this country is very chemical intensive

我国的玉米生产是化学密集型的
and there are energy costs for this,

同时也是能源密集型的
but concerned about the environment and we'll talk more about that later.

说到环境我们待会再深入讨论
It's very interesting to think about how corn gets raised.

如何种植玉米值得深思
Let's talk about climate change for just a moment, which is a big issue.

我们来谈谈气候变化这个大问题
A lot of people are more concerned about climate change than they.

较如何种玉米不少人更关注气候变化
Agriculture is contributing to climate change

农业与气候变化有关