World Ocean Day

Patricia Gibson Excerpts

Thursday 8th June 2023 Westminster Hall

[Patricia Gibson (North Ayrshire and Arran) (SNP)]

I echo the congratulations to the hon. Member for Hastings and Rye (Sally-Ann Hart) on bringing forward this important debate. It has become something of an annual event to have a debate that coincides with World Ocean Day on 8 June, and it follows, as we have heard, from a recent debate on the impact of plastic in our oceans.

This year’s theme is “Planet Ocean: Tides are Changing”. The tides may well be changing, because experts warn us that we are reaching a tipping point that will bring devastating and dramatic consequences for mankind with regards to our oceans. The purpose of World Ocean Day is

“to inform the public of the impact of human actions on the ocean, develop a worldwide movement of citizens for the ocean, and mobilize and unite the world’s population on a project for the sustainable management of the world’s oceans.”

This day reminds us all of the major role that oceans play in our everyday lives. They are the lungs of our planet, a major source of food and medicine, and a critical part of our biosphere. The ocean covers the majority of the Earth, but only a small portion of its waters have actually been explored. Despite humanity’s utter reliance on it, and compared to the breadth and depth of what it gives us, the ocean receives only a fragment of our attention and resources in return. That surely has to change.

The latest estimates from the UN Educational, Scientific and Cultural Organisation warn that more than half of the world’s marine species may stand on the brink of extinction by 2100. Temperatures have increased by 1.1°C, and an estimated 60% of the world’s marine ecosystems have already been degraded or are being used unsustainably. Warming of 1.5°C threatens to destroy 70% to 90% of coral reefs, and a 2°C increase means a near 100% loss—a point of no return.

The ocean occupies over 70% of the planet’s surface area and produces at least 50% of the world’s oxygen. It is a hugely significant force in mitigating climate change. Despite that, its role is most often considered as passive rather than active, but it has a significant role to play in slowing down the rate of climate change. Since 1978, over 90% of Earth’s increased heat and 40% of carbon from fossil fuels have been absorbed by the ocean. In addition, it is predicted that the ocean has absorbed between 30% and 50% of all carbon dioxide emissions caused by human activity, which makes it the biggest carbon sink in the world, as we have heard today.

I want to talk about ocean acidification. When CO₂ dissolves in sea water, the water becomes more acidic. The acidity of our oceans has increased by 26% since about 1850, and staggeringly, the pace of change is around 10 times faster than at any time in the last 155 million years.

Ocean acidification reduces the amount of carbonate, which is a key building block in sea water. That makes it more difficult for marine organisms such as coral and some plankton to form their shells and skeletons and existing shells may begin to dissolve. The present-day pH of sea water is highly variable and a single organism can cope with fluctuations of different pH levels during its lifetime. The problem with ocean acidification is the sustained nature of the change, as the risk comes with the lifetime exposure to lower pH levels. Further, the rapid pace of acidification will influence the extent to which calcifying organisms will be able to adapt.

The impact of ocean acidification is not uniform across all species, but a more acidic environment will harm marine species such as molluscs, corals and some other varieties. Marine organisms could also experience changes in growth, development, abundance and survival in response to ocean acidification. Most species seem to be more vulnerable in the early stages of life. Juvenile fish, for example, may have trouble locating a suitable habitat. Research suggests that ocean acidification will also be a driver for substantial changes in ocean ecosystems this century. Those changes may be made worse by the combined effects of other emerging climate-related hazards, such as the decrease in ocean oxygen levels—a condition known as ocean deoxygenation—which is already affecting marine life in some regions. Ocean acidification also has the potential to affect food security, coastal protection, tourism, carbon storage and climate regulation because more acidic oceans are less effective in moderating climate change. To reduce the impact of ocean acidification, we need to improve our air quality, develop sustainable fisheries management practices and sustainably manage habitats, as well as establishing and maintaining marine protected areas, about which we have heard a lot today. Currently, only around 8% of our oceans are protected. We need to do more, but on a global and international basis.

A recent YouGov survey of 1,696 adults found that almost three quarters of people in the UK say ocean life needs more protection. At this juncture, I wish to pay tribute to Sir David Attenborough, whose “Blue Planet” programmes brought the ocean world into our living rooms and showed us the wonders and the beauty of our oceans in such an educational and breathtaking way. He also warned us that the living world cannot operate without a healthy ocean—nor can we. The ocean may connect, sustain and support us all, but, according to the UN,

“its health is at a tipping point and so is the well-being of all that depends on it.”

The UN hopes World Ocean Day will help inform the public of human actions on the ocean and develop a worldwide movement to protect it and unite the world in seeking to sustainably manage our oceans, making this is an important day on the global calendar.

I will end with the wise words of Sir David Attenborough:

“Nowhere is more powerful and unforgiving, yet more beautiful and endlessly fascinating than the ocean.”

It is time we act globally in a way that shows we understand how important our oceans are and stop taking them for granted.