An international summit on the environment is being held in Tucson and today attendees had the chance to hear from a celebrity activist about his work.
Adrian Grenier, who is known for his role on the HBO series "Entourage," spoke to young leaders about how to re-think industry to create a more sustainable future.
Grenier recently launched a foundation called Lonely Whale that works to connect people with the ocean.
He says this is his second time in Tucson after he presented a documentary about celebrity obsession several years ago.
Grenier says its inspiring for him to be in Tucson because there are a lot of "thinkers" here.
