Being responsive from mobile to desktop

Two months ago I was in a situation where I thought about making my website responsive. At the time I was working on my first responsive website One Planet One World. Applying the mobile first responsive web design mindset; start with the mobile version and work towards larger versions (tablet and desktop).
For One Planet One World it was a natural choice to go mobile first. Having the benefit of a clean sheet and the use of the Roots WP theme (implements HTML5 Boilerplate), which already advocates mobile first in its stylesheet [rule 93-101]. But for my own website I already had the styling for the desktop version. A question arose: “degrade from desktop to mobile or enhance from mobile to desktop?” The first option would mean I only had to make media queries for the mobile and tablet versions. The second option would mean I had to start from scratch (sort of).














