For economic tutor only

The Massachusetts Water Resources Authority (MWRA) claims that the $3.8 Billion dollar Boston Harbor Cleanup has been a great success. 


a.) Please present evidence (data for a specific parameter) that water quality is better in Boston Harbor than it was 20 years ago? Explain why this data supports your claim that water quality is better now. 


b.) What can you do to make the water quality (with respect to this parameter) even better?  Extend the data given above into the future. How clean can Boston Harbor water become (with respect to your measurement)? Please be specific.

3.) Ecosystems
a.) Design an ecosystem in a glass container 12” x 12” x 12”.  (Just describe it and draw it, you don’t have to build it.  No shrimp please!) This is a closed system…no gas, liquid, or solid can enter or leave.  Light can enter and heat can be transferred through the glass.  You can add anything you want before you seal it.  Describe what biotic (living) and abiotic (non-living) components are needed to make this a sustainable ecosystem.  What does it mean to be sustainable?
b.) Describe the flow of a single carbon atom in the ecosystem you have created. How long might the carbon atom reside in each of 5 reservoirs in your cycle?