Will our lakes reflect our actions?

August 27 this year marks the inaugural World Lake Day, established by the United Nations in response to Indonesia’s call for global action. It is a timely moment to reflect on the vital role lakes play in our ecosystems and communities — and the urgent need to protect them.

Why lakes matter

Lakes are more than scenic landscapes. They regulate climate by absorbing floodwaters and storing carbon, and they hold over 90% of the Earth’s surface freshwater. Lakes have nurtured human civilisation for millennia, serving as essential sources of food and water, supporting biodiversity, and offering recreational and economic opportunities through tourism, fishing, and water sports.

A growing threat

Despite their importance, lakes around the world are deteriorating. Their water quality and quantity are under pressure from pollution, over-abstraction, and climate change. The damage is accelerating — and we may be closer to a tipping point than we think.

Understanding the tipping point

We often assume change is gradual. But sometimes, it could be exponential. Consider this classic math problem:

In a lake, a patch of lily pads doubles in size every day. It takes 48 days for the patch to cover the entire lake. On which day is the lake half-covered?

The answer is day 47.

That means in just one day, the lake goes from half-covered to choked of sunlight and oxygen. It is a powerful metaphor for environmental change: by the time we notice the damage, it may be too late.

From liability to resource: Wastewater reuse

One major contributor to lake degradation is untreated wastewater. An estimated 80% of global wastewater enters water bodies untreated, harming both ecosystems and human health.

Proven technologies can cost-effectively treat pollutants and enable industries to reuse water. In many cases, closed-loop or partial reuse systems are not only environmentally responsible — they also make financial sense by reducing freshwater intake costs and discharge fees.

Embracing these solutions requires a mindset shift: to see wastewater not as a problem, but as a resource. It also demands investment in water infrastructure that supports resilient, future-ready businesses.

Around the world, forward-thinking industries, municipalities, and communities are already taking steps toward water reuse. Their actions show that change is possible — and scalable.

On this first World Lake Day, let’s ask ourselves: Will our lakes reflect our neglect, or our commitment to change?

By rethinking how we treat and reuse wastewater, we can protect these vital ecosystems and ensure they continue to sustain life for generations to come.