CO2 - You can find some information in the wiki:
http://www.mynissanleaf.com/wiki/index.php?title=Battery_Capacity_Loss" onclick="window.open(this.href);return false;
Using the default information Stoaty put in the battery degradation spreadsheet, for Norfolk VA you would still have 71% battery capacity at 9 years (YMMV). In other words pretty close to Nissan projections.
It's pretty close to what I would see here in KC and the summers here are not gentle.
Remember end of life of the battery is 70%. Using Stoaty's math you wouldn't loose first capacity bar (15% IIRC) until sometime after the first 2.5 years of ownership. This is assuming you don't park in the sun. Check out the variables in the excel listing.