URBANISATION is the increase in population as a result of Rural-Urban Migration.
RURAL-URBAN MIGRATION is when people move from rural areas, like farms/countrside, to urban areas, like cities.
URBAN RENEWAL is the renovation and improvement of existing buildings
URBAN REGENERATION- 'knock it all down and start again'
GENTRIFICATION is when the character of an area changes or when local people are forced to move out.
SUSTAINABILITY is meeting the needs of the population without damaging or exploiting natural resources