The ocean covers 70% of the surface of Earth. It is a vital natural resource that produces food and oxygen, and has been key to trade and exploration for thousands of years. Despite this, our ocean is being damaged by overfishing, pollution, invasive species, acidification, and sea temperature rise. Ocean conservation will be one of the future generation’s defining missions. Photography courtesy of George F. … Continue reading National Geographic Encounter: Ocean Odyssey Special Collection: Treasure Trove of Ocean-Themed Classroom Material