In environmental performance analysis of food systems, is it safe to analyze trade off & synergies of environmental indicators as a separate objective from life cycle assessment?
You will need to do Prospective Scenario Analysis or Systems expansions to model your trade-off & synergies in LCA. Sensitivity and Uncertainty analysis are a must in those cases
YES, I think the two processes are quite different. While in Life analysis/Assessment (which may be similar to Carbon Footprints) you are focusing on understanding the entire life cycle of a certain product by quantifying all the inputs involved and the outputs obtained (You analyze the product from its raw materials to the end when it is disposed or recycled). From this analysis/Assessment you will understand where there is a highest environmental impact. But in the former, I guess you can now use the information you got in analysis/assessment to compare the cons and benefits.