Responsive Design is Killing Two-Thirds of Your Conversions. Here's How to Fix It. There's a 270% gap in conversions between desktop and mobile, because mobile websites suck and we’re all doing it wrong...
Google champions responsive Web design in page ranking update Google has deprecated the desktop Web. It's still here, but for Google it just got less important.
Bootstrap 3.x - Theme framework for Responsive Web Design A popular theme framework for building responsive website design (RWD)