Until he got rich writing interminable _Dune_ sequels, Frank Herbert's
entire career was mostly writing ecologically-themed sf. This way predates
the Gaia Hypothesis, so there's not much explicitly Gaian, but _The Green
Brain_ and _Santaroga Barrier_, for example, might be considered precursors.
Incidentally, his very first novel, _Under Pressure_ (also published as
_The Dragon in the Sea_), from the 1950's, held up completely until the
collapse of the USSR.
Neil Rest
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