I don't know; but, when I make my list of possibilities and order it by probability: «the universe has always been here and simply changed form about 13 billion years ago» is right up near the top and «the christian god did it» is down at the bottom (religion.blogs.cnn.com)
«For it to work it has to be a genuine change of heart that says «we understand what it is about our past behaviour you do not like and we will have a top to bottom change in culture and behaviour that shows change as well as claims it.».» (totalpolitics.com)
Striking changes in salinity are found from the surface to the bottom in the northern North Atlantic near water mass formation sites that fill the water column (Section 5.3.2); bottom changes elsewhere are small, being most prevalent at the under - sampled southern ends of both sections. (ipcc.ch)