Natural Environment Blog

Colorful fish at Rapture Reef, French Frigate Shoals of the Northwestern Hawaiian Islands

According to the Australian newspaper, several scientists have downplayed the significance that global warming will have on our coral reefs.

Specifically, they respond to a recent comment by University of Queensland’s Professor Ove Hoegh-Guldberg, that sea temperatures are likely to rise 2C over the next three decades, which would undoubtedly kill the Great Barrier Reef in Australia.

Professor Hoegh-Guldberg, also of the Australian Research Council’s Centre for Excellence for Coral Reef Studies (CoECRS), has spent the past 15 years warning us about the impact of climate change on the coral reefs.   

But Dr Andrew Baird principal research fellow at CoECRS says that this is a pessimistic view, and that there are serious knowledge gaps about the impact that rising sea temperatures would have on coral. 

Baird believes that coral has the ability to adapt to climate change.

“I believe coral has an underappreciated capacity to evolve. It’s one of the biological laws that, wherever you look, organisms have adapted to radical changes.” he said.

However, Dr Baird did acknowledge that we need to do something about the impact of climate change on coral reefs.

“There will be sweeping changes in the relative abundance of species,” he said. “There’ll be changes in what species occur where.

“But wholesale destruction of reefs? I think that’s overly pessimistic.” he added.

Russell Reichelt, chairman of the Great Barrier Reef Marine Park Authority shared Dr Baird’s sentiment.

“I think that he’s right,” he said. “The reef is more adaptable and research is coming out now to show adaptation is possible for the reef.”

Dr Reichelt, a marine scientist, believes that the greatest threat to the Great Barrier Reef is water quality. In particular, he refers to the coastal regions where sediment and fertilizer is draining into the ocean and therefore threatening the future of the Great Barrier Reef, the world’s largest coral reef.

“If a reef’s going to survive bleaching, you don’t want to kill it with a dirty river,” he said.

Coral can Cross-Breed

Baird and Reichelt aren’t the only ones who believe that coral could adapt to climate change.

Recent studies carried out by CoECRS have found that at least one species of coral can cross-breed and create a hybrid species, suggesting that coral may in fact be able to adapt to climate change.  

Ocean Acidification

Rising sea temperatures isn’t the only threat to our coral reef systems. Ocean acidification has been recently cited as a major threat.

At least three recent studies - one of which professor Hoegh-Guldberg was involved in - have concluded that rising CO2 emissions is a major threat to coral reefs around the world. This is because increased CO2 leads to increased ocean acidification - which in turn, destroys coral reefs.

The largest natural feature on earth is so large, that it can be seen from space!

Earth’s largest natural feature is the Great Barrier Reef.

The Great Barrier Reef is a massive collection of coral reefs located along the north eastern side of Australia. It is the world’s most extensive coral reef system and is one of the world’s richest areas in terms of faunal diversity.

The reef is part of the Great Barrier Reef World Heritage Area, which at 35 million hectares, is the world’s largest World Heritage Area. About 98 percent of the Great Barrier Reef World Heritage Area is located in the Great Barrier Reef Marine Park, which was declared in 1975 with the purpose of preserving the area’s outstanding biodiversity whilst providing for reasonable use.

Here are some interesting facts about the Great Barrier Reef:

• There are more than 2900 coral reefs
• 600 continental islands
• 71 coral islands
• 300 coral cays
• 1500 species of fish
• 4000 species of molluscs
• 500 species of seaweed
• 350 types of starfish and various echinoderms
• More than 215 species of birds
• 1.9 million tourists visit the Great Barrier Reef each year
• The Great Barrier Reef is over 12,000 years old
• The reef itself stretches more than 2300 km from the northern tip of Australia’s Queensland to just south of Bundaberg (also in the state of Queensland)
• The Great Barrier Marine Park covers 348,000 square kilometers - that’s larger than the whole of the UK and Ireland combined!

The Great Barrier Reef is Under Threat

Unfortunately, the Great Barrier Reef is under threat from overfishing, land-based pollution and coral bleaching. Coral bleaching is exacerbated by increased sea temperatures due to global warming. As a result of public campaigning and pressure from WWF, the Australian Government has committed to protecting 33% of the reef where it can (previously, only 4% had been protected).

Regarding the impact of global warming on the reef, it’s not just affecting the Great Barrier Reef. To date, 10% of all reefs around the world have been destroyed due to coral bleaching. At the current rate, 70% of the world’s reefs will be destroyed over the next 40 years.

As hopeless as this may sound, there are things we can do to help. By developing greener habits, we can all do our part in reducing global warming. For example, here are 5 ways to reduce greenhouse gases. And here are some simple steps you can take to live sustainably.