What evidence is there that shows an increase in extreme events or their intensity due to AGW globally?

I think there is none yet. The most extreme events are only within the past six months. The most devastating floods in history prior to last year covered 90 SQK. The floods in Pakistan covered more then twice that. And the current floods in Australia covered 10x that. There might never have been floods as extensive as the Pakistan floods, and yet flooding 5x worse comes just months later.

Within the next two years there will be published studies testing the association between the warmest global temperatures ever recorded for a year and the extreme event that happened in that year:

* the greatest flooding ever recorded, in Australia

* the greatest flooding ever recorded (until 5 months later when the record was broken.

There is no proof. There is merely the curious incidence of scientists warning of more flooding followed by the worst flooding ever seen.

A 2005 National Geographic articles states:

"a new study in the journal Nature found that hurricanes and typhoons have become stronger and longer-lasting over the past 30 years. These upswings correlate with a rise in sea surface temperatures." (1)

A more recent (2008) article in Time mentions a newer study on the same issue:

"Researchers led by James Elsner, a meteorologist at Florida State University, analyzed satellite-derived data of tropical storms since 1981 and found that the maximum wind speeds of the strongest storms have increased significantly in the years since, with the most notable increases found in the North Atlantic and the northern Indian oceans. They believe that rising ocean temperatures — due to global warming — are one of the main causes behind that change." (2)

As always, Skepticalscience.com has good info on the issue: http://www.skepticalscience.com/hurricanes-global-...

PS Limited my search to hurricanes for now. It's a bit late where I am :-)

Edit Jim Z:

If you are so knowledgeable about proper scientific research and procedures, as you pretend to be here on YA, then how come you hardly ever back up any of your denier claims with evidence? Is it perhaps because you realize all too well that 99,9% of "denier science" is BS (bad science)?

India:

http://www.sciencemag.org/content/314/5804/1442.ab...

Northern UK increased, but southern (the drier bit) seeing no major changes:

http://onlinelibrary.wiley.com/doi/10.1002/joc.943...

China has seen flat total rainfall, but increase in intense rainfall events:

http://journals.ametsoc.org/doi/pdf/10.1175/JCLI-3...

Much of SE Asia and the S Pacific has seen an increase in the proportion of rainfall coming in 'extreme' events, even if the total rainfall has fallen:

http://onlinelibrary.wiley.com/doi/10.1002/joc.610...

United States:

http://journals.ametsoc.org/doi/abs/10.1175/1520-0...

Increasing over the 20th century, but only recently more intense than earlier.

The continuing exposure of hectares of land in the Northern Hemisphere concerns me. Whether we are the cause I doubt that. I think you could include the polar bears and penguins, as evidence. Is it getting too warm where bees winter and is that allowing the growth of the germs that are killing them off? Time will tell.

Ask and ye shall receive.

*edit* you just have to love jim. He complains about Gringo's answer, which references a peer-reviewed study in one of the world's most prestigious scientific journals, while jim himself gives nothing but his own ignorant opinions.

http://www.youtube.com/watch?v=jqxENMKaeCU

I can't believe anyone gave Gringo any thumbs up for that worthless answer. There isn't any evidence and his links are to the same biased sources. There isn't even evidence for significant AGW. Only to an alarmist is anectdotal evidence and feelings worth anything. It isn't in science or in the real world. .

there is none