Oxygen measurements help determine role of oceans and plants in greenhouse 19 July 1999 As levels of the greenhouse gas carbon dioxide rise, concentrations of oxygen in our air have fallen.
(concentrations of oxygen in our air; have fallen; ) Context(concentrations of oxygen in our air have fallen,List([141, 188))):(Oxygen measurements; help; determine role of oceans and plants in greenhouse 19 July 1999 As levels of the greenhouse gas carbon dioxide rise) Context(Oxygen measurements help concentrations of oxygen in our air have fallen,List([0, 188))):(Oxygen measurements; help determine; role of oceans and plants in greenhouse 19 July 1999 As levels of the greenhouse gas carbon dioxide rise)
concentrations of oxygen in our air have fallen,List([141, 188)) Oxygen measurements help concentrations of oxygen in our air have fallen,List([0, 188))
concentrations of oxygen in our air Oxygen measurements Oxygen measurements
have fallen help help determine
determine role of oceans and plants in greenhouse 19 July 1999 As levels of the greenhouse gas carbon dioxide rise
role of oceans and plants in greenhouse 19 July 1999 As levels of the greenhouse gas carbon dioxide rise