From blowing conch shells to ringing church bells and sending mobile phone alerts, Caribbean countries are looking at high and low-tech ways to alert citizens to run for safety in the face of tsunamis which could wreak havoc on unprepared communities.
Renowned tsunami expert Prof. Fumihiko Imamura uses the occasion of World Tsunami Awareness Day to draw attention to the threat of "black tsunamis" caused by pollution of the seas
