1. When answering this question, consider discussing the regulatory and social pressures that have led companies to reduce pollutants. Mention government regulations that enforce limits on emissions and pollutants, which compel companies to adopt cleaner technologies and practices. 2. Additionally, discuss the role of public awareness and consumer demand for environmentally friendly products, which have pressured companies to become more sustainable. Highlight examples of industries where significant reductions in pollutants have been observed due to these pressures.

1. 在回答这个问题时，考虑讨论促使公司减少污染物的监管和社会压力。提到通过政府法规强制限制排放和污染物的政策，迫使公司采用更清洁的技术和实践。 2. 此外，讨论公众意识和消费者对环保产品的需求在推动公司变得更具可持续性方面的作用。举例说明由于这些压力，在哪些行业中观察到了污染物显著减少的情况。