It is a single cause through multiple vectors. What has changed in the last 30 years? A widespread use of fluoride, household and garden chemicals, radiation through wifi and cell towers, vaccines, pharmaceuticals designed to help symptoms not cure disease and the list goes on. Modern lifestyle is the cause and its has been intentionally, insidiously and with malice been thrust upon us through misleading advertising and propaganda psyops and the use of chemical and biological warfare.

When I saw this meme I didnt see them explicitly state any one of these methods were what changed, I see the whole of the deception as the cause.