What is the ocean changed by?

* Climate change: The ocean is absorbing heat from the atmosphere, which is causing it to expand and sea levels to rise. The ocean is also becoming more acidic, which is harmful to marine life.

* Pollution: The ocean is polluted by a variety of sources, including sewage, agricultural runoff, and industrial waste. This pollution can harm marine life and make the ocean unsafe for swimming and fishing.

* Overfishing: The ocean is being overfished, which is reducing the populations of fish and other marine life. This can disrupt the food chain and harm the entire marine ecosystem.

* Habitat destruction: The ocean is losing habitat due to development, pollution, and climate change. This can harm marine life and make it more difficult for them to survive.

* Invasive species: Invasive species are non-native species that have been introduced into the ocean. These species can outcompete native species for food and habitat, and can also transmit diseases to native species.