1. A socio-political movement disposed to make extreme claims and advocate extreme measures regarding the preservation, restoration, or improvement of the natural environment.
2. The practice of ecovangelising
One who preaches environmentalist dogma with militant or crusading zeal.
<she practices ecovangelism with religious fevour>
<the public are becoming tired of being spoken to in this ecovangelistic way>
<she was an ecovangelist, but now the arguements she uses are more balanced>