The tide is high

(AP Photo/Somnuk Attipanyo)

There are 33 cities around the world that are expected to have more than 8 million residents by the year 2015. At least 21 are vulnerable to rising sea levels and other disasters due to climate change.

Keep reading for a list of some of the more prominent cities cited by the Worldwatch Institute.

• Dhaka, Bangladesh.
• Buenos Aires, Argentina.
• Rio de Janeiro, Brazil.
• Shanghai and Tianjin in China.
• Alexandria and Cairo in Egypt.
• Mumbai and Kolkata in India.
• Jakarta, Indonesia.
• Tokyo and Osaka-Kobe in Japan.
• Lagos, Nigeria.
• Karachi, Pakistan.
• Bangkok, Thailand.
• New York.
• Los Angeles.

-- Howie Rumberg