Joining Dry January in the calendar of one-month movements aimed at self improvement is Veganuary. With more than 80,000 Americans signed up  this year (and 500,000+ worldwide), Veganuary encourages you to do your best to ditch meat, dairy and eggs this month. Adweek's T.L. Stanley and David Griner dig into how Veganuary got so much global (and brand-supported) momentum so quickly.