Quick on the heels of the Shop Drop Challenge, in which more than 500 of you joined me to save 3,000 pounds of landfill waste and $30,000 by swapping or thrifting our style for the month of January, I started hearing rumors of a new H&M Conscious Collection that was blowing the socks off eco fashion. And since this is the one time of year that I don’t feel (too) guilty shopping new, I decided to head over to the mall to investigate. Now you know now much I rail against the mall, home of bottom-of-the-barrel fast fashion houses like Forever 21, which have outsourced our $3 trillion a year…