March On Global Warming Expected To Draw Thousands

Thousands of people from across the nation are expected in New York City to participate in what's billed as the largest march ever on global warming.

Organizers of Sunday's march say they want to raise awareness about climate change. Similar gatherings are scheduled in other cities worldwide, including Rio de Janeiro and Lagos, Nigeria.

The march through Manhattan comes two days before the United Nations Climate Summit. More than 120 world leaders will convene Tuesday for the meeting aimed at galvanizing political will for a new global climate treaty by the end of 2015.

The march also coincides with New York's annual climate week, which will include a string of events this week, some featuring celebrities, CEOs and climatologists.

The march starts at 11:30 a.m. EDT.