With some confidence, we can say that these two things are connected, and that there's probably a substantial contribution from greenhouse warming.

With some confidence, we can say these two things must be connected.

We're not even at the peak of the current cycle — we're only halfway up and already we're seeing activity in the North Atlantic that's 50 percent worse than what we saw during the last peak in 1950.

This trend in sea surface temperature that's sort of relentlessly rising and the hurricane intensity that's relentlessly rising (means that) it's with some confidence we can say that these two things are connected and that there's probably a substantial contribution from greenhouse warming.

We were not expecting to get caught up in the global warming debate when we published our initial research last September. But the whole question of global warming is something that has to be confronted.

That may seem like a small number, but it makes a huge difference in ocean temperature and it has many consequences.