I can add a little bit there, and maybe John could pick up after.
To me, there are two key areas. Area number one is the area of impacts and adaptation. It's really a new field in terms of trying to understand, taking the scale of projections that are done on core scales by the big climate models and trying to bring them down to the scale that affects everyday people--the scale of subcontinents and regions.
The second area is the fundamental physics still involved in the climate projections. When you try to do impact and adaptation studies, they're only as good as the information you get. And as you start to try to provide higher and higher resolution information, you're going to have to start to resolve more and more physical processes. These include, and do not exclude, things like permafrost and the carbon that is contained in the frozen soils of our north. There are no climate models out there that incorporate frozen soils and the bio-geochemistry of those frozen soils into a potential positive feedback to warming that may or may not occur. These are the kinds of areas that need to be continued.
Maybe John could add on that.