Sentence:  ‘And whadda you want?' the barman spat at me. / Above his head was a large sign that read ‘Fertilize the Bush – Doze in a <WSD>Greenie</WSD>'. I was dressed in a flannelette shirt and army trousers – exactly like the <WSD>Greenie</WSD> protestors they′d been battling the previous year. 
Meaning of the word marked with <WSD> tags:  An environmentalist; someone who shows concern for the environment.