Brownfields are landfills that have been converted to farmland. contaminated areas in cities that have to be abandoned. facilities that use plants to convert hazardous wastes to less harmful substances. farmland that has been made useless because of improper disposal of toxic waste. abandoned land in cities that are put to use for community gardens or other green space.

Explanation:

Brownfields are unused urban spaces, usually defined by their previous industrial use and therefore might have soil contamination but not necessarily. Their shared characteristics are that they no longer serve the intended purpose (eg. Factory gone bankrupt), are abandoned or at leasr under used, contain(ed) buildings, might be contaminated, requite outside help to be revitalised.

an economic of depression