The wistful mood of this story reminded me of another I read several years ago called No Renewal. I found it on-line and am giving you the link here : https://missjagmohan.wikispaces.com/file/view/No+Renewal.pdf

You approached the subject in a slightly different way focussing more on the death of the planet rather than individual mortality, but the mood was the same. I thought you should read it and appreciate the synchronicity