Mies van der Rohe said "less is more". Robert Venturi said "less is a bore." Fontainebleau Hotel architect Morris Lapidus said "too much is never enough." TreeHugger falls into the Miesian camp, the minimalist look. When you are living in tiny spaces and often reading TreeHugger on tiny screens, a simple, sans serif typeface is easier on the eyes.
So for our birthday we have adopted Open Sans. Steve Matteson designed it "with an upright stress, open forms and a neutral, yet friendly appearance. It was optimized for print, web, and mobile interfaces, and has excellent legibility characteristics in its letterforms." No more archaic and silly serifs clogging up your pixels.
We have also mixed up the colors ( enough green, we are now the world's largest burnt orange lifestyle website) and changed our header to give us more room for in-your-face messages. More changes will be rolled out in the coming weeks. Like any change it takes a bit of getting used to, but compare the upper and lower versions above, the open sans is a little looser and I think a little easier to read on the bigger screen, and definitely easier on your phone or your new iWatch.