Growth is a worry as the "Emerald City" - nicknamed for its evergreen trees and environmentalist politics - strives to become "carbon neutral" by 2050, meaning it will produce no more climate-changing emissions than it can offset by measures such as planting carbon-absorbing trees.
The environmental authority in Chile approved after more than a year of evaluation, the development of the largest desalination plant in Latin America, with an initial investment of about $500 million.
