Dear teachers,<br/><br/>The following caption shows an adjective in the position of an adverb. Is this standard English? <br/><br/>I think it shall say "environmental<b>ly</b>". What do you say?<br/><br/><a href="http://www.popsci.com/science/article/2010-07/whitening-worlds-roofs-can-offset-cars-co2-emissions-20-years-study-says">Whitening Cities' Roofs Is <b>Environmental</b> Equivalent of Taking 300 Million Cars Off the Road, DoE Study Says</a>