A proposed ban on plastic bottles at the Grand Canyon is back on track, according to a report in USA Today. A ban on bottles was originally set to go into effect in January of 2011 but that plan was eventually shelved.

At the time, some accused Coca Cola of pressuring the National Parks Service to re-think the ban. Coke is a major supporter of the National Parks and also sells Dasani water at many parks across the country.

But a new directive released today from the NPS will allow individual parks to ban plastic bottles in 2012 as long as a regional director signs off on an impact analysis of the move.

According to officials, plastic bottles make up 30% of the waste found at the Grand Canyon and is the single largest source of trash at the site.