Propose and evaluate action for managing a geographical challenge in a selected megacity

What this dot point is asking

This is the Topic 2 dot point that asks you to take one geographical challenge in a megacity you have studied and propose a justified action to manage it, then evaluate that action. "Propose" means recommend a specific, realistic response; "evaluate" means weigh its strengths and limitations against criteria such as effectiveness, cost, equity and sustainability. The challenge might be transport, housing, water, flooding, waste or air quality. Strong answers choose one megacity and one challenge, propose a concrete action, and evaluate it with evidence and named comparison cities.

The answer

Choosing a challenge and a place

The task narrows to one megacity and one challenge so you can go deep. Pick a challenge with clear causes, clear impacts and known management responses, for example Jakarta's flooding and subsidence, Lagos's transport and housing, Delhi's air quality, or Dhaka's flood vulnerability. Define the challenge precisely, including who and what it affects, before proposing action.

Categories of management action

Megacity challenges are managed through several lever types:

• Infrastructure and technology. Bus rapid transit, metro systems, water treatment, sea walls, drainage.
• Planning and regulation. Zoning, building standards, congestion charging, emissions controls, protected green space.
• Upgrading and inclusion. Improving informal settlements in place rather than demolishing them, securing tenure, adding services.
• Economic instruments. Subsidies, charges and incentives to shift behaviour.
• Governance and participation. Coordinated metropolitan government and community involvement so responses fit local needs.

Worked responses by challenge

• Transport. Curitiba in Brazil pioneered bus rapid transit, with dedicated bus lanes and tube stations moving large numbers cheaply, widely copied because it costs far less than a metro. Bogota's TransMilenio applied the model at megacity scale.
• Housing and inclusion. Medellin in Colombia upgraded informal hillside settlements with cable cars (Metrocable), libraries and public space, connecting marginalised neighbourhoods to the city and reducing inequality and violence.
• Flooding and water. Jakarta combines sea walls, pumping, river restoration and a contested plan to relocate the capital to higher ground, responding to subsidence and flooding driven by groundwater over-extraction.
• Sanitation and water supply. Slum sanitation and piped-water programs reduce disease in rapidly growing cities.
• Air quality. Delhi has trialled vehicle restrictions, cleaner fuels and construction controls, with mixed results because the sources are regional and political.

Evaluating the action

Evaluation is the higher-band skill. Judge a proposed action against explicit criteria:

• Effectiveness. Does it materially reduce the challenge?
• Cost and feasibility. Can a fast-growing, often resource-limited city fund and maintain it?
• Equity. Does it help the poorest residents or mainly the wealthy? Slum upgrading scores well on equity; a metro that bypasses informal areas may not.
• Sustainability. Does it work over the long term across environmental, economic and social dimensions?
• Unintended effects. Could it displace residents, induce sprawl, or shift the problem elsewhere?

The strongest evaluations compare alternatives. Bus rapid transit is cheaper and faster to build than a metro but has lower capacity; in-situ slum upgrading is more equitable than clearance but slower and politically harder. Naming the trade-off and reaching a justified judgment is what the criteria reward.

Reaching a justified recommendation

Conclude with a clear, evidence-based recommendation for the specific city and challenge, acknowledging its limitations and the conditions needed for success (funding, governance, community support). A recommendation that ignores cost, equity or maintenance is incomplete.

Examples in context

Example 1. Curitiba bus rapid transit. A cheaper, faster alternative to a metro that moves large passenger volumes; evaluated as highly cost-effective but lower capacity than rail.

Example 2. Medellin Metrocable and upgrading. Cable cars and public investment connect marginalised hillside settlements to the city; evaluated as strongly equitable and socially transformative, with high but justified cost.

Example 3. Jakarta flood and subsidence response. Sea walls, pumping and a contested capital relocation address flooding from groundwater over-extraction; evaluated as partly effective but enormously costly and socially disruptive.