$($a$)$ Briefly explain the four pillars of sustainability.

$($b$)$ Star Coffee has made an evaluation of the social and environmental costs of its coffee roasting facility. The total cost of running the roasting facility is Tk$.987654,$ including Tk$.689001$ for the cost of unroasted beans and environmental costs of Tk$.91173,$ as shown below.

Depreciation of oven fume extractor systemp

Employee training costs to reduce environmental accidents Monitoring system to detect fumes $A$

Fine for dumping coffee grounds into the sewer

Inspection of drainage systems to detect per f

Reduction in value of

Disposal of waste coffee grounds?

Medical costs relating to employees' inhalation of fumes

Total

Required:

$($i$)$ Identify the social costs that relate to the operation. Is there a link here between social costs and environmental costs?

$($ii$)$ Prepare an environmental cost analysis of the existing cost of Tk$.91173,$ highlighting appraisal, prevention and failure costs.