Tourists watch cruises arriving at the port in Ushuaia, Argentina in this April 2, 2007 photo. Drawn to the blue-ice glaciers and penguins of the Antarctic and a cheaper peso since Argentina devalued its currency in 2002, visitors come in droves to Ushuaia, billed as the world's southernmost city.

But the tourism and construction boom has led to a chaotic surge of migrant workers, swelling its population by 30 percent in six years to nearly 60,000. Limited space, government red tape and poor planning have forced some newcomers to occupy state lands, shivering their way through a bitter winter in makeshift huts. Some encroach on woodlands, raising environmental red flags.

在這幀四月二日的檔案照中，觀光客正在岸邊看遊輪駛進阿根廷的烏斯懷亞港。被南極藍色的冰河和企鵝吸引，加上阿根廷通貨披索在2002年貶值，遊客成群結隊湧入烏斯懷亞這個號稱世界最南端的城市。

但觀光和營建業興盛，使外來民工爭先恐後湧入，當地人口在短短六年內激增百分之卅，已逼近六萬人。有限的空間，政府的官僚作風和繁文縟節以及粗陋的規畫，迫使一些新來者占據國有地，並在臨時搭建的小屋中顫抖度過嚴冬。有些甚至侵入林地，使環境亮起紅燈。