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One or two years of increased storm activity, esp. when the increase is as compatible with a competing (and independently needed) cycle, doesn't mean a whole lot. One problem is that nobody, IIRC, has a good model for why the cycle of weaker/stronger hurricanes is as it seems to be; another problem is that we have records for less than two cycles, and that's not a whole lot--before that a hurricane could build and die with scant observation, and even for the early part of that cycle we don't know if the records are complete. Remember, Katrina and Rita were category 5, but if you had to rely on on-shore observations they'd come in at 3 or 4 and 3, respectively. Some of the claims that storms are stronger this cycle rely crucially on knowing that in the '20s and '30s we had an accurate read of the maximum intensity of all the storms that occurred.
On the other hand, nobody seriously questions that there's been a recent increase in global temperatures; the jury was seriously out in the late '90s, as people argued over how to interpret partial data from previous decades, how to deal with varying techniques and standards for calibrating satellite sensors, and the like. These were reasonable: the onus is on those claiming warming to show that it was occurring, and to answer criticism of their claims. Much of the correlation's been cleaned up, and possible causality between actual environmental factors and the observed correlation has been posited. Models are neater and have proven retroactively right for the very recent past (while I haven't seen them subject to serious critiquing, I assume--only 'assume', mind you--that they have been).
Now it's still a question of causation, and what to do about it. There's still wriggle room, last I checked, with true believers on one side and die-hard skeptics on the other.
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