Celebrate World Oceans Day today, June 8, 2025

World Oceans Day 2025

World Oceans Day has fallen around June 8 every year since 1992. It’s a day to honor our connection to Earth’s oceans – even if we don’t live near a beach – and to learn what we can do to protect ocean habitats. This year, it’s celebrated today, June 8.

World Oceans Day 2025 has the theme of WONDER: Sustaining What Sustains Us.

The day is meant to shed light on the wonder of the ocean and how it’s our life source, supporting humanity and every other organism on Earth.

Here’s a calendar of additional events around the world.

2025’s theme

According to World Oceans Day:

The ocean’s wonder is what draws us in and often drives our desire to protect it.

Wonder is the foundation of scientific knowledge, the allure behind exploration, the curiosity that drives innovation, and the seed of traditional wisdom. In the face of increasingly daunting challenges, the act of wondering serves to remind us that we are part of something bigger. It wakes us up to our inherent connection to the Earth and to each other, expands our understanding of what is possible, empowers innovation and prioritizes decision-making for collective well-being.

This World Oceans Day, we celebrate the ocean’s essential wonder from all of the wonders it consists of to the wonder it ignites, and call on decision-makers to not lose sight of the ocean’s wonder when determining its fate.

Why Earth’s oceans are so important

Earth’s oceans are critical to human survival. Indeed, more than half the oxygen in our atmosphere is generated via photosynthesis by phytoplankton and seaweed in oceans. In addition, millions of people depend on fish and other marine animals for food. Research on some marine organisms has led to the development of new medications. Moreover, ocean currents, known as global conveyor belts, help regulate Earth’s climate.

Perhaps the best reason we’ve seen to honor and protect Earth’s oceans comes from the 2013 video below, featuring Sylvia Earle, who is a National Geographic Society Explorer-in-Residence and perhaps the world’s most recognized living oceanographer. In the video below, among other things, Earle says:

I think of the ocean as the blue heart of the planet.

In addition, she says:

We, too, are sea creatures.

History of World Oceans Day

Canada made the original proposal for World Oceans Day in 1992 at the Earth Summit in Rio de Janeiro, Brazil. Subsequently, the day was unofficially celebrated on June 8 until 2008, when the United Nations officially recognized it. Since then, The Ocean Project and the World Ocean Network have coordinated World Oceans Day internationally. These organizations say they have had greater success and global participation each year.

We know that human activities have adversely affected the health of oceans: pollution, over-fishing, seawater acidification due to increased carbon dioxide, ocean warming and habitat destruction. There is so much to do to repair the damage.

So, what can you do to help?

There are things you can do on your own, on this day or any other. For example, if you live near an ocean, perhaps join a shoreline cleanup.

Even if you’re not near the sea, you can encourage your seafood retailers and favorite seafood restaurants to source their seafood more sustainably (Monterey Bay Aquarium’s Seafood Watch program is a terrific resource).

And we can all reduce our use of plastics with reusable shopping bags and refillable water bottles, and by using biodegradable products over plastic.

Watch NASA’s perpetual ocean video 2

Longing for the ocean? Check out this video with photos from the EarthSky community.

Bottom line: World Oceans Day is a day to honor our connection to Earth’s oceans and to learn what we can do to protect ocean habitats. Celebrate World Oceans Day in 2025 on June 8.