Add punctuation to the following sentence: Obviously the first option provides the most precise results and has been the preferred choice but emission inventories of sufficient quality are only available for a few impact categories and therefore the developed extrapolation method was applied for the local and regional impact categories to yield figures on the Global scale
Obviously, the first option provides the most precise results and has been the preferred choice, but emission inventories of sufficient quality are only available for a few impact categories and therefore the developed extrapolation method was applied for the local and regional impact categories to yield figures on the Global scale.