More than 70% of the earth’s surface is covered by oceans. Supplying half of its oxygen, the ocean is our planet’s life support system. Oceans help keep Earth’s climate habitable. By moving water around the globe, the oceans keep places from getting too hot or too cold. Oceans help keep the planet warm by storing vast amounts of heat, and currents carry the heat around the planet. There are many plants in the ocean that produce the oxygen that humans and land animals need to breathe. Scientists estimate about one million species of animals live in the ocean. About 95% are invertebrates. Some animals are very large, like the blue whale, others are so small they can only be seen with a microscope. The oceans provide seafood and recreational opportunities for people all over the globe. The highest mountains and deepest trenches on our planet are found in the oceans. We can all work to create positive change to make a healthier planet.