SAN DIEGO (CBS 8) - Demonstrators from around the world united Sunday to urge policy makers to take action on climate change. 

Hundreds of thousands took part in marches ahead of Tuesday's meeting at the United Nations to discuss the formation of a new Global Climate Treaty before 2016.

Participants here in San Diego marched downtown.

In this video report, CBS News 8's Kelly Hessedal is in downtown with more on the local event.