Sebastiao Salgado talks about the importance of forests in the world. When he was young he grew up on a beautiful farm, and when he returned as an adult it was completely gone. He rebuilt his forest and encourages others to do the same. His speaking techniques was just simple talking. There was no humor, but feeling. He talked to his audience like they were regular people. His presentation style was mainly using pictures, after all, he was a photographer. He used his photographs of the beauty of the nature he was trying to preserve to make his case on why the forest should be saved. His talk is important because, well, trees are important. They turn CO2 into oxygen, they keep the air cool and moist, and keep the water running and keep the soil in place. They are an irreplaceble, and need to be saved.