One reason for finding out more about human demands on nature is that if we continue with business as usual, we may not have adequate resources to feed all of our needs by the 2030s.
Construction leads to timber production, forest loss and finally habitat loss. Energy-use leads to greenhouse gas emissions, loss of wetlands and finally climate change.
Some of the possible limitations you may have thought of regarding the ecological footprint are that this concept involves many assumptions including future human demands, advancement and efficiency of technologies, estimations of natural resources reserve, etc. These variables could change over time or political conditions.
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