Despite all these promising results, the main single limited factor for achieving economic rentability remain high transport costs from the origin of garbage to the transformation site.

UNESCO: Background

The hustle factor has created Hong Kong's vast strengths as a centre for transport, finance and communications.

ECONOMIST: Is Hong Kong ripe for a bit of central planning?

This has been interpreted as meaning the overriding factor is the arrival of new people living close together, rather than public transport which is constant all year round.

BBC: NEWS | UK | Magazine | Bugs get the train too

Another factor is the increase in urban wildlife, especially deer, who are thought to transport the pests into gardens and from there, into our homes.

BBC: NEWS | UK | Magazine | Itching to get at you