https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/33717/GST4_v9_Feb10.pdf
This is a document discussing challenges that the UK and the rest of the world may face in the future. On page 91 and 92, it mentions possible events that are rather unpredictable which could change the world radically -- "strategic shocks". Such as:
a cure for aging
new energy sources ( cold fusion reactors are mentioned explicitly)
the discovery of intelligent non-terrestrial life.
Apparently, the UK government feels a need to at least consider what might happen if....
metatron