Nov. 2, 2026

One Promise: How a Postcard Changed Behaviour for a Year

Picture a kid at an aquarium in Durban, South Africa. She's standing in front of the penguins with a pen and a postcard. She writes one sentence and drops it into a little post box.

That sentence became part of some of the best evidence we have that small promises change what people do.

When caring freezes you in place

If you've been following the ocean news, you know it's a lot. Coral bleaching. Collapsing shark populations. Climate targets slipping out of reach.

Caring about something that big can freeze you. There's a name for it: eco-anxiety. When it gets bad, it turns into inertia. The problem feels so huge that anything you could do seems pointless, so you do nothing, and then you feel worse.

Andrew knows that loop well. He's always found it hard to start things, whether it's a job around the house or a batch of podcast episodes. Not starting leads to not finishing, the anxiety builds, and the next day is harder. What helps him most is getting to it right away, before the problem has time to grow in his head.

Most people care. They're just overwhelmed.

Andrew's work in science communication started with that same frozen feeling, except it wasn't his.

Fresh out of his master's degree, he got a question from a family member, a paramedic in New York City. Should he be worried about climate change? What was really going on?

Andrew's first reaction was surprise. How did a smart guy not know this? Then it hit him. Of course he didn't know. He spent his days running into emergencies. Nobody had ever explained the issue to him, or why it should fit into an already full life.

That lesson has stuck. Most people care. They're overwhelmed, and nobody has handed them a first step that fits their life.

Penguin Promises

So what does a first step that fits look like? For that, we go to uShaka Sea World in Durban, and a campaign built around one bird.

The African penguin is found only in southern Africa. It brays like a donkey and waddles like you'd expect. It's also in serious trouble: breeding pairs have fallen by more than 90% since the 1950s, and in 2024 the species was listed as Critically Endangered.

In 2011, Gabrielle Harris, an educator at the South African Association for Marine Biological Research (SAAMBR), which runs uShaka Sea World, launched a campaign called Penguin Promises. Most conservation campaigns ask for money. This one didn't. Its tagline: "We don't want your money, honey, we want your love."

Here's how it worked. Visitors, often families and often kids, picked up a printed postcard and wrote one change they promised to make in their daily life to help the ocean. Use a reusable bag. Turn off the lights. Pick up litter at the beach. Take shorter showers. Then they posted it in a special box on site.

By 2015, more than 10,000 promises had been collected. An early look at 500 cards found a pattern: women were more likely to make promises than men, most promisers were under 20, and most were visiting as families.

Did anyone keep their promise?

Collecting promises is the easy part. The team wanted to know whether people followed through.

So they followed up. Twelve to eighteen months after their visit, people who had left an email address on their card got a short survey: Do you remember your promise? Did you keep it? Why or why not?

The peer-reviewed results, published in Environmental Education Research in 2018, are striking. Of 316 people who responded, more than half still remembered their promise, and about half could describe a positive action for the environment that they credited to the campaign. That's from one sentence on a postcard, more than a year later.

What people experienced at the aquarium mattered too. Seeing, hearing and being close to the animals was one of the things connected to following through.

Why the postcard worked

Plenty of aquarium visits end the same way. People have a great time, look at the exhibits, maybe chat about them, and walk out without a clear sense of what to do next. The message fades at the door.

Look at what the postcard asked for instead:

It was specific. One change, nothing more.
It was in their own words. People chose their own action.
It was handwritten. Writing it down turns a feeling into a commitment.
It was small enough to start that day. One habit you could begin before dinner.
It was tied to something they loved. The penguins swimming right in front of them, and often the kid standing beside them.

There's a bigger lesson here. Most of what drives biodiversity loss comes down to human behaviour. As a friend of Andrew's likes to say, conservation is really about managing people. And behaviour changes one person, one habit, one promise at a time.

Start where you live

When the big problems feel overwhelming, Andrew asks himself one question: what can I do in my own community?

Coral bleaching and wildfires can feel a long way from home. Your family, your neighbours, your work and the people you see every week are right there, and that's where your effort goes furthest.

It helps even more to do it with others. Join a beach cleanup crew, a local conservation group or a citizen science project. You get the impact of the work, plus something that matters just as much for eco-anxiety: people around you who share your values, and a place to talk about the environment without feeling attacked online.

It doesn't have to feel like homework, either. On South Africa's KwaZulu-Natal coast, a group called Wild Alliance Africa celebrates the Aliwal Shoal Marine Protected Area every August 1 for MPA Day. In 2025, four of them walked 32 kilometres down the beach, from Happy Wanderers Beach to the Illovo River. Friends joined for stretches along the way. They stopped to talk with beachgoers about the protected reef just offshore and recorded the wildlife they spotted.

This year they did it again and made a whole weekend of it, adding a film screening, a boat dive on the reef, a whale-watching trip and a guided rock pool walk. A few people on a long stretch of sand had a great day outside with friends, and went home inspired. That's what keeps people in this for the long haul.

Your one promise

This is the action that ties together the whole week of episodes.

Write down one specific ocean promise. Make it concrete. For example:

"I'll look up the marine protected area nearest me and visit it this year."
"I'll comment on the next MPA consultation in my region."
"I'll ask where my fish came from every time I buy it."

Put it where you'll see it every day. The fridge, the bathroom mirror, your laptop.

Tell someone. Your partner, your kid, a friend. Make it a family thing if you can.

Now picture yourself a year from now. The note is still on the fridge, a little faded. You've kept the promise long enough that it's just part of how you live. Your kid asked about it and made one of their own. A friend saw it and picked one too.

That's how those penguin postcards worked. One sentence, kept for a year, passed along to the people around you.

The ocean's problems are big. You're allowed to start small.

Takeaways

Eco-anxiety can freeze you; one small, specific action breaks the loop
Most people care but are overwhelmed and haven't been given a first step that fits their life
Penguin Promises at uShaka Sea World asked for one handwritten promise instead of money
About half of follow-up respondents could describe a positive change 12 to 18 months later
Specific, handwritten, small and tied to something you love: that's what made it stick
Acting locally and with a group helps both the ocean and your eco-anxiety
Your action: write down one ocean promise, post it where you'll see it, and tell someone

Sources

Andrew Lewin

CEO

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