(also "Sustainerati") A category of persons who, often unwittingly, undermine their own cause - sustainability - by either:
a) Turning people off by treating them in a condescending or judgmental manner, or
b) Demonstrating and/or promoting an attitude that small incremental efforts are not worth applauding.
Joe rode his bike to work for the first time today. As Joe entered work wearing his bike helmet Elmo, clearly a member of the sustaineratti, sneered "it's about time".