There is good evidence and physical grounds for CO2 and orbital variations influencing glacial cycles, but that by no means shows that they completely control the glacial system. (dotearth.blogs.nytimes.com)
This had to be true on physical grounds if they were indeed caused by the «seed» fluctuations that made the observed structure in the Universe. (newscientist.com)
This position assists the Grounds Supervisor with keeping Glen Eyrie physical grounds and associated property maintained. (ziprecruiter.com)