David Helvarg is an American journalist and environmental activist. He is the founder and president of the marine conservation lobbying organization Blue Frontier Campaign.He is associated with the 'Seaweed rebellion' marine environmentalist movement. He is an author; his writing is often related to marine environmental activism, such as his second book, Blue Frontier. His first book, The War against the Greens, argues that violent organized resistance is being orchestrated against the environmental movement.