Climate change is one of the greatest challenges facing humanity. On land its impacts are well known: higher temperatures, stronger storms, droughts for some and more rain for others, wildfires and pest outbreaks, etc.

Without the ocean, climate change would be much worse. The ocean absorbs huge amounts of CO₂. It’s taken in roughly 25 percent of all CO₂ emissions since the late 1700s, and 80 percent of the heat from global warming! This is great for our climate, but it comes at a cost to the ocean. We can expect to see:

Rising ocean acidity reduces the availability of carbonate minerals which are used by thousands of marine species to form shells and skeletons. These “calcifying” organisms – such as corals, shellfish, and tiny marine snails known as pteropods – are important in marine ecosystems from the tropics to high latitudes and the deep sea.

When there is less carbonate available, it is increasingly difficult for these creatures to build their homes and sources of protection. Ocean acidification threatens species throughout the web who feed on these creatures – from salmon to whales.

The ocean is one of the largest carbon dioxide (CO₂) sinks on the planet. It naturally absorbs CO₂ from the atmosphere and can store it for thousands of years. However, since the Industrial Revolution the ocean been trying to keep up with the extra emissions from humans. Here’s the chemistry lesson:

When CO₂ is absorbed by the ocean it reacts with water (H₂O) to form carbonic acid (H₂CO₃).
     CO₂ + H₂O = H₂CO₃

Our oceans’ inhabitants are in trouble. 75 percent of the world’s fisheries are either fully exploited, over-exploited or have collapsed. Worldwide fishing capacity is 2.5 times larger than what the oceans are able to sustainably produce. It’s time for humans to change the way we use the ocean’s once bountiful resources, because there are no longer plenty of fish in the sea.

The Issues:


Fishing Gear


At least half of our seafood comes from fish farming or ‘aquaculture.’ Fish farming is an incredibly diverse industry. It can occur in open water, semi-contained or contained systems, and involve countless different species and rearing methods. Different types of fish farming also cause a wide range and intensity of environmental impacts.