A generic life cycle has six stages. It begins with Stage 1…
A generic life cycle has six stages. It begins with Stage 1 and continues chronologically through Stage 4. Stages 5 – Remanufacturing (i.e., unidirectionally connecting Stage 4 to 1) and 6 – Recycling (i.e., unidirectionally connecting Stage 4 to 2) are the disposition pathways. If the gate is set between stages 2 and 3, and this is a cradle-to-gate assessment, (i) draw the LCA diagram with proper labeling and denotations . Using the LCA diagram from part “i” and the table data below, (ii) calculate and show the cumulative emission rates for the life cycle stages within the study boundary . If the threshold for a high-emission hotspot is above 3 t/yr and a mid-emission hotspot is between 2 t/yr and 3 t/yr, (iii) list which study life cycle stage(s) would be considered a high- and mid-emission hotspot, respectively . (Notes: The tonnage unit is metric tons) Stage 1 (or Unit Process 1) Stage 2 (or Unit Process 2) Activity Units Value Activity Units Value 1 t/yr 0.95 1 t/yr 1.1 2 g/yr 2098 2 kg/yr 320 3 kg/yr 1205 Stage 3 (or Unit Process 3) Stage 4 (or Unit Process 4) Activity Units Value Activity Units Value 1 t/yr 0.35 1 kg/yr 2130 2 t/yr 0.7 3 t/yr 0.2 4 t/yr 3.1 Stage 5 (or Unit Process 5) Stage 6 (or Unit Process 6) Activity Units Value Activity Units Value 1 kg/yr 5355 1 t/yr 0.59 2 t/yr 0.3 3 t/yr 0.25