Why should business practitioners $($like us$)$ need to understand Moore's Law?

To foresee the need to recycle old, obsolete technologies in the workplace $($i$.$e$.,$ computers, machines$).$

All the other three answers are correct.

To make going green a branding initiative, if possible, by having recycling programs for old products, or selecting green business partners and suppliers.

To be aware of and utilize advanced computing powers to innovative business ideas, or foresee such initiatives from competitors.