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A global strategy for road building.

William F Laurance1, Gopalasamy Reuben Clements2, Sean Sloan1

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Road expansion will increase by 60% by 2050, impacting biodiversity. This study proposes a global zoning plan to balance road development with conservation and agricultural needs.

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Area of Science:

  • Environmental science
  • Conservation biology
  • Urban planning

Background:

  • Global road networks are projected to expand by 60% by 2050, with most construction in developing nations.
  • Road expansion drives habitat loss, fragmentation, and environmental degradation, particularly in biodiverse regions.
  • Current road planning is often reactive and struggles to keep pace with rapid expansion.

Purpose of the Study:

  • To present a global scheme for prioritizing road construction.
  • To minimize environmental costs while maximizing benefits for human development, specifically agricultural production.
  • To identify areas for road avoidance, strategic development, and conflict resolution.

Main Methods:

  • Global analysis of environmental values and agricultural potential.
  • Development of a large-scale zoning plan for road infrastructure.
  • Identification of priority areas for road building and conservation.

Main Results:

  • Identification of areas where road building should be avoided due to high environmental value.
  • Designation of areas for strategic road improvements to boost agriculture with minimal environmental impact.
  • Pinpointing of 'conflict areas' with high agricultural benefits but significant environmental risks.

Conclusions:

  • A proactive zoning plan is crucial for managing road expansion during a critical period of development.
  • Prioritizing road construction can mitigate negative environmental impacts and support global food security.
  • The proposed scheme offers a template for sustainable infrastructure development and biodiversity conservation.