To get back to your question about natural variability versus climate change, we've been very careful in differentiating the variability that is inherent in the system, which is what I will call the multi-decadal or interannual variability, which is most of the variability that we're going to see, versus the trend that we've seen since the beginning of the previous century.
Making that distinction was part of everything we did in the risk assessment in all the climate research that we're actually doing. There are certain features of the inherent variability that we see from year to year. We can partition that, the year effect, I would call it, or the decadal effect, versus the long-term trend. When we talk about climate change, we talk about the change that will occur over the next century.