““Many of you remember when Dutch Elm disease swept the East Coast. People in big cities saw the trees die but it didn’t register, in any way at all, that this would compromise oxygen. Think of it, that many trees dying in that short a time span means there is less photosynthesis. Less oxygen is being produced. Therefore pollution in the big cities becomes more pronounced. These basics do not occur to people who work in buildings where the windows don’t open.””