3. Recife, Brazil

Recife, Brazil [huanqiu.com]

Recife in northeastern Brazil is a business center and also a prime destination of tourists, who visit here for the pleasant weather and white beaches. Same as Rio De Janeiro and Argentine Buenos Aires, due to its dense coastal development, now Recife is highly vulnerable to the threats of rising sea levels, hurricanes and storm surges. The degeneration of coral reefs also exposes the whole city to flooding.