I have a question in your edited version. In the following sentence, I don't understand why "at" should be added. please check and let me know if "at" was mistakenly written or is something necessary to have... I need to submit the paper soon. So please reply as soon as you see my message.<br /><br />
<p>Siloxanes are globally produced <strong>at</strong> over one million tons per year, with a predicted 6.2% per year increase in its applications (Hagmann et al., 1999; World Silicones, 2011).</p>