Are there more tropical cyclones now than in the past -- or is it just something we believe because we now hear more about them through media coverage and are better able detect them with satellites?

New research from the Niels Bohr Institute clearly shows that there is an increasing tendency for cyclones when the climate is warmer, as it has been in recent years.

The results are published in the Proceedings of the National Academy of Sciences.

..."We have calculated that extreme hurricane surges like Katrina are twice as likely in warm years than in cold years.

So when the global climate becomes 3 degrees warmer in the future, as predictions show, what happens then?," reflects Aslak Grinsted.