作者称，伴随着生物原料转变成塑料成品的整个过程，这些影响主要来自于化肥，杀虫剂的使用以及退地还耕的举措。
These impacts came largely from fertilizer use, pesticide use and conversion of lands to agricultural fields, along with processing the bio-feedstocks into plastics, the authors reported.
即便声称免耕对水土保持有益处也并非通用，而是取决于土壤的种类与农场作业方式。
Even claimed benefits of no-till for soil and water conservation are not universal but depend on soils and farm practices.
气是无明火，忍是敌灾星，但留方寸地，把于子孙耕。
The gas is does, endure is the enemy, but to leave the bitterest curse of ground, children in crops.
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