|
http://news.bbc.co.uk/1/hi/sci/tech/4249138.stmRecords for the past 35 years show that hurricanes have got stronger in recent times, according to a global study.
This fits with mounting evidence which suggests the biggest storms around the world - hurricanes, typhoons and cyclones - are intensifying.
Some US scientists say that greenhouse warming may be driving the most severe events, such as Katrina, although more research is needed to be sure.
Their assessment of hurricane activity is published in the journal Science.
The idea that global warming might have an impact makes sense in theory, at least, since tropical storms need warm ocean water to build up strength.
But most scientists believe there is currently insufficient evidence to make such a claim, partly because of the lack of reliable long-term data.
Satellite data
Now, scientists at Georgia Institute of Technology in Atlanta, Georgia, and the National Center for Atmospheric Research in Boulder, Colorado, have analysed global tropical cyclone statistics since satellite records began.
I think probably the sea surface temperature increase is a manifestation of global warming Dr Peter Webster They found that there has been a sharp rise in the number of category 4 and 5 tropical cyclones - the most intense hurricanes that cause most of the damage on landfall - over this time period.
Between 1975 and 1989, there were 171 severe hurricanes but the number rose to 269 between 1990 and 2004.
|