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Medium-density housing is a term used in Australia to describe residential developments that are at higher densities than standard low-density, (or 'broadhectare') suburban subdivisions, but not so high that they might be regarded as high density housing. The density of standard suburban residential areas has traditionally been between 8-15 dwellings per hectare.

An urban forest is a forest or a collection of trees that grow within a city, town or a suburb. In a wider sense it may include any kind of woody plant vegetation growing in and around human settlements. In a narrower sense (also called forest park) it describes areas whose ecosystems are inherited from wilderness leftovers or remnants. Care and management of urban forests is called urban forestry.

Recycling is a process to change (waste) materials into new products to prevent waste of potentially useful materials, reduce the consumption of fresh raw materials, reduce energy usage, reduce air pollution (from incineration) and water pollution (from landfilling) by reducing the need for "conventional" waste disposal, and lower greenhouse gas emissions as compared to plastic production.