Sometimes, renewable innovations such as hydroelectric dams disrupt the course of natural systems, resulting in significant losses.
With climate change threatening the survival of many, the world has become overly eager to expand green capacity.
One of the biggest, longstanding sources, hydropower, has made its mark in ensuring reliable, utility-scale electricity generation.
But will investing in this significant clean power source end up destroying the environment rather than saving it?
How a “green” giant ended up shaping the modern world
Hydroelectricity truly left a lasting impact by serving as the first bridge between the Industrial Revolution and the renewable era.
It became a symbol of progress and served as the pinnacle of engineering for over a century.
Initially, its purpose was to prevent devastating flooding and direct the flow of freshwater for the community and agriculture.
However, from the early 20th century to the post-war construction boom, it became the first taste of carbon-free, “baseload” power.
As more people became aware of climate change, hydropower took on the original “hero” role of the green transition.
Today, it is the biggest source of renewable energy globally, by far outpacing intermittent sources such as solar and wind.
It has played a critical role in curbing global emissions, but researchers have uncovered a biological “blind spot.”
While the numbers may add up on paper, the real-world consequences of hydropower have become increasingly alarming.
Becoming a liability in a warmer world
The global climate crisis has been an issue for decades, but lately, Earth’s temperatures have been warmer than usual.
Greenhouse gas emissions in the atmosphere have warmed the planet since the late 1800s. However, 2026 will be one of the hottest years ever recorded.
These sudden and rapid spikes in global warming over the last couple of years are accelerating climate change.
NOAA has confirmed in a statement that atmospheric patterns are changing. Regions will now alternate between heavy rain and extreme droughts.
This has raised concerns about the increased strain on the planet’s freshwater sources.
Furthermore, the infrastructure, once designed to alleviate drought pressures, is now speeding up water loss.
Giant reservoirs have left stagnant water vulnerable to direct sunlight, especially in hot, arid regions. This boosts evaporation, rapidly depleting the world’s most vital resource.
However, freshwater is not the only thing that is lost due to hydropower dams.
The silent loss in the riverine biodiversity
Giant dam projects may solve some crises, but inadvertently create others.
Freshwater habitats may cover only 0.01% of the planet’s surface, but they are home to 6% of all known species.
Researchers have now pointed out that the presence of dams not only empties rivers but also threatens these species. The details can be reviewed in the study “Freshwater biodiversity impacts of global hydropower dams” published in Nature.
A higher risk of survival in dammed regions
Giant hydropower sites have become the most sensitive ecological zones in the world.
Analysis of data spanning from 1996 to 2022 indicated that some species have become more threatened in these areas. This includes fish, mollusks, and aquatic mammals.
Dams disconnect some fish species from vital migration routes and expose mammals to habitat change. Reservoirs cause flooding and fragmentation, which destroy their specific terrestrial-aquatic corridors.
The silent impact of hydropower on the environment highlights that sustainability must not be measured by carbon emissions alone.
The accelerating water scarcity crisis has raised the stakes, proving that rivers must be recognized as living systems.
To prevent the UN’s warning of complete global “bankruptcy,” future infrastructure must be based on nature-positive approaches. This way, climate targets and power needs do not have to leave a trail of extinction behind.
