Speculation: Scientific literature may be dominated by American
   English even among those not of American origin. It may be due
   to the worldwide commercialism of American culture over British
   culture. An example of such might be the increase in hyperbole,
   a very American thing (adopted in Britain in dramatic form in
   their media) over the past 50 years or so. a potential sign of
   this process, if it does, indeed exist, which it may not at all.
   Again: Speculation.