The city's annual series of parades began more than a week ago and will close out on Tuesday — Mardi Gras — a final day of revelry before Lent. Aside from recycling, there's a small but growing movement to find something else for parade riders to lob. Grounds Krewe, Davis's nonprofit, is now marketing more than two dozen types of nonplastic, sustainable items for parade riders to pitch. "These efforts will help green Mardi Gras," said Christy Leavitt, of the group Oceana, in an email. Enck, who visited New Orleans last year and attended Mardi Gras celebrations, hopes parade organizers will adopt the biodegradable alternatives.

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