Editing Urban Metabolism (section)

== <span style="color: #FFFFFF;">Applying</span> ==
'''Modeling 'The Resource Efficiency' (Calculating the 'Output/Input' ratio of a city):'''
<syntaxhighlight lang="python">
def calculate_urban_efficiency(total_inputs_tons, recycled_outputs_tons):
    """
    Shows how 'Circular' a city is.
    """
    waste_to_landfill = total_inputs_tons - recycled_outputs_tons
    efficiency_pct = (recycled_outputs_tons / total_inputs_tons) * 100
    
    if efficiency_pct > 80:
        return f"METABOLISM: CIRCULAR ({efficiency_pct}%). A 'Forest' City."
    elif efficiency_pct > 30:
        return f"METABOLISM: TRANSITIONAL ({efficiency_pct}%). Some recycling."
    else:
        return f"METABOLISM: LINEAR ({efficiency_pct}%). A 'Resource Sink'."

# Case: A typical city (1M tons in, 100k tons recycled)
print(calculate_urban_efficiency(1000000, 100000))
</syntaxhighlight>

; Metabolism Landmarks
: '''The 'Singapore' Water Loop''' → (NEWater). Singapore "Recycles its Sewage" into "Pure Drinking Water," "Closing the Loop" and ensuring "Survival" on a small island.
: '''Hammarby Sjöstad (Stockholm)''' → The "World's Best Example" of a "Circular Neighborhood": every "Waste" from one building is the "Fuel" for another.
: '''Vertical Farming''' → (See Article 245). Bringing the "Mouth" of the city (Food) "Inside the city," reducing the "Transportation Metabolism."
: '''Urban Heat Recovery''' → Using the "Heat from Subways" to "Provide Hot Water" for "Nearby Schools," turning "Waste Energy" into "Resource."
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