Climate change, pollution, and overfishing are all taking a heavy toll on our fisheries and our planet. Climate change is affecting the ocean on many levels. These changes influence everything from droughts and floods to marine life and ocean currents. Pollution has destroyed entire aquatic habitats and left us with giant patches of floating debris all over our oceans. Overfishing leaves us with destroyed ecosystems, nutrient-lacking species, and a lack of biodiversity in our very sophisticated food web.