Letters to the Editor, December 3, 2013
I refer to the article ("City warned to brace for more powerful typhoons", November 22). Based partly on the latest report of the Intergovernmental Panel on Climate Change (IPCC), the Hong Kong Observatory sounded alarm bells for local powerful typhoons, widespread flooding, higher temperatures and a rise in sea-levels in the future.

The alarm is uncalled for because water vapour, the most important greenhouse gas showing the best correlation with temperature changes, has been ignored. Heat generation causing water vapour to enter the atmosphere is the real problem.
Heavier rainfall causing widespread flooding has more to do with land reclamations and natural variability rather than the level of carbon dioxide.
The rise in average temperature in the city by 1.2 degrees since 1913 is best explained by the urban heat island effect.
The tide gauge record in Victoria Harbour from 1954 to the present is obtained from two tide gauge stations (North Point 1954-1984 and Quarry Bay 1985-present). Both are located on reclaimed land with questionable ground stability.
In any event, the less than 60 year tide gauge record and the satellite altimetry record available since 1992 are both too short to reliably indicate the rate of future sea-level change.