ecospheren.

1953 H. Strughold Green & Red Planet iv. 43 Only a small zone about 75 million miles wide—out of the 4,300 million that stretch between the sun and Pluto at its farthest point—provides a planetary environment well-suited to the existence of life. We might call this zone the thermal ecosphere of the sun. Other stars may have such ecospheres of their own.

1965 S. Dole & I. Asimov Planets for Man iv. 109 To be habitable, a planet must be inside the ecosphere.

1997 Jakarta Post (Nexis) 21 Apr. If developing a technological civilization is an automatic death sentence, and the way hi-tech civilizations die destroys the possibility of another intelligent species evolving in the same ecosphere, then maybe there really is nobody out there.

1958 L. C. Cole in Sci. Amer. Apr. 83/1 Probably I should apologize for using a coined word like ‘ecosphere’, but it seems nicely to describe just what I want to discuss. It is intended to combine two concepts: the ‘biosphere’ and the ‘ecosystem’.

1974 M. W. Fox Understanding your Cat viii. 168 It is man's ego that..transforms the ecosphere into a global egosphere.

1979 J. Oberg in O. Davis Omni Bk. of Space 20 Gravity is another factor that will transform a hostile planet into a habitable, productive ecosphere.

1997 New Scientist 28 June 87/1 (advt.) The impact of the plant rhizosphere on contaminant behaviour in the ecosphere and its role in phytoremediation of metal-contaminated sites.

2003 Focus July 92/1 It's perhaps the first time ever that a single species has had the power not just to destroy itself completely, but to take the rest of the ecosphere with it.