Can your organization win new clients that demand ISO 14001 certification? Can your organization reduce costs due to a systematic improvement of environmental issues? For example, while implementing an environmental management system I was able to reduce costs, and improve productivity, by changing to water-based adhesives instead of solvent-based ones or reduce energy consumption due a systematic attack on compressed air leaks or reduce cost with waste disposal due to better segregation and different and better destinations instead of just dumping in a landfill. If you can attach money to your promise, you can make them see ISO 14001 as an investment, what can be earned in return for an implementation cost.
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