Oceans cover 71% of the earth's surface. It often seems like the conversation about climate change focuses on what's happening in our atmosphere, but there are many changes happening in our oceans. The oceans have absorbed 90% of the excess heat and 28% of the carbon pollution generated by human consumption of fossil fuels (Nuccitelli 2015). The purpose of this article is to show how the effects of climate change are impacting the coral reefs of our oceans, with a particular focus on the coral reef systems of the Caribbean and the Great Barrier Reef. Caribbean coral reefs are known to have suffered more damage between the two reef systems. This is not to say that the Great Barrier Reef has not suffered damage of its own. He has suffered and will continue to suffer in the future. Corals use these products to produce proteins, fats and carbohydrates and produce calcium carbonate. Calcium carbonate is what coral uses to build its hard skeleton. The world's coral reefs are of great importance because they are home to 25% of all marine life on the planet. Now that corals have been briefly described, we can understand why the effects of climate change damage coral reef systems. Ocean acidification is a consequence of climate change. Acidification is caused by an increase in carbon dioxide in our oceans and leads to a decrease in the pH levels of marine waters. This decrease in pH reduces the ability of corals to build hard skeletons. Coral calcification rates on the Great Barrier Reef and many other coral systems around the world have declined by 15–20% since 1990 due to increasing thermal stress (De'ath 2012). It has already been said that the oceans absorb almost all the excess heat resulting from climate change. This affects coral reef systems in what is known as coral bleaching. The term bleaching refers to the loss of coral colors. The color of a coral is the result of the zooxanthellae present. When the water gets too hot, the