农业是在大自然中进行的；大自然里的生态系统中各种生物和活动相互影响，而粮食的生产正是处在这样的生态环境中。
Agriculture takes place in nature, among ecosystems of interacting organisms and activity, and crop production takes place within that ecosystem environment.
他说：“有些媒体在说，中国开发了水电，上游开发水电对下游国家有没有影响啊？”生态环境会不会遭到破坏？
He says there have been media reports that China's upstream hydropower development is having a negative impact on downstream countries, especially environmentally.
实际上大部分引入物种(对生态环境)一点(消极)影响也没有。
Indeed, most species that get introduced don't have much effect at all.
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