Glacial Floods, Climate Change, and What the U.S. Can Learn from the Himalayas Disaster

February 2, 2025 / activist360

Field evidence of sediment aggradation. (A to F) Photographs taken along the Teesta River show the aggradation of the sediments transported by the flood cascade and its impact. Latitude, longitude, and elevation (in m a.s.l) are at top right; locality name and distance from SLL are at bottom right. Photo credits: Praful Rao (study co-author).

A Disaster Unfolds

Imagine waking up in the middle of the night to a roaring wall of water crashing through your town. That’s what happened in Sikkim, India, on October 3, 2023. A glacial lake high in the Himalayas burst suddenly, sending a flood of 50 million cubic meters of water rushing downstream. Villages were washed away, bridges collapsed, and a massive hydropower dam was completely destroyed.

The flood traveled 385 kilometers, even reaching parts of Bangladesh. This was no ordinary flood—it was a Glacial Lake Outburst Flood (GLOF), a type of disaster that’s becoming more frequent as the planet warms.

What Caused the Flood?

At the heart of this disaster was South Lhonak Lake, one of the fastest-growing glacial lakes in the Himalayas. Scientists have been watching it for years, warning that its natural dam—made of ice and rock—was getting weaker.

Then, the worst happened:

A 14.7-million cubic meter chunk of frozen land collapsed into the lake.
This triggered a 20-meter-high wave—as tall as a six-story building.
The wave smashed through the natural dam, sending a torrent of water and debris barreling down the valley.

Think of it like a bathtub overflowing, except instead of a few gallons of water, it was millions of tons rushing out all at once.

The Impact: Lives, Land, and Infrastructure Lost

The destruction was swift and brutal:

55 people lost their lives, and 74 are still missing.
More than 7,000 people were displaced, their homes and villages washed away.
31 bridges, 25,900 buildings, and 276 square kilometers of farmland were destroyed.
The flood carried away 270 million cubic meters of sediment—enough to fill 100,000 Olympic-sized swimming pools.

Entire communities were left without power, food, or clean water, and the road to recovery is long.

The Role of Climate Change

So, why did this happen? The simple answer: climate change.

The South Lhonak Glacier has been melting faster than ever, losing 0.58 meters of ice every year.
The lake it feeds has grown dramatically in the past few decades.
Warming permafrost (frozen soil) is making mountain slopes unstable, increasing the risk of landslides and dam failures.

This isn’t just a Sikkim problem—glaciers around the world are melting at record speeds, putting millions of people at risk.

Could This Happen Again?

Unfortunately, yes. Scientists warn that South Lhonak Lake is still unstable.

The natural dam is eroding, making another flood likely.
Riverbanks weakened by the last flood could collapse, leading to more destruction.
Extreme rainfall—which is increasing due to climate change—could trigger another disaster.

And it’s not just Sikkim—other glacier-fed lakes in the Himalayas, the Andes, and even North America are showing similar warning signs.

Why This Matters

If you think this is just a distant problem, think again. The same climate forces that caused the Sikkim flood are also affecting other mountainous regions worldwide.

Melting Glaciers Are a Global Issue

Glaciers are retreating in Alaska, the Rocky Mountains, and the Pacific Northwest. As ice melts at a faster rate, more glacial lakes are forming, increasing the chances of floods like the one in Sikkim. If we don’t prepare, communities in mountainous regions of the U.S. could face similar disasters.

U.S. Disasters Are Increasing

The 2022 Yellowstone flood destroyed roads, bridges, and homes, forcing many residents to evacuate. In California, record-breaking storms and floods are becoming more frequent, causing billions in damage. Extreme weather events—whether floods, hurricanes, or wildfires—are getting stronger, deadlier, and harder to predict.

Our Infrastructure Is at Risk

Just like the Teesta-III dam in Sikkim collapsed, many worldwide dams, roads, and power plants are vulnerable to extreme weather. Many of these structures were built decades ago and weren’t designed to handle the kinds of disasters we’re seeing today.

We Can Learn

By taking action now, the U.S. can prevent similar disasters:

Invest in early warning systems—monitor unstable lakes and glaciers.
Upgrade infrastructure—build flood-resistant bridges and roads.
Plan for extreme weather—ensure communities are prepared for disasters.

Preventing Another Tragedy

While we can’t stop glaciers from melting overnight, we can take steps to reduce the damage.

Early Warning Systems (EWS)

Science and technology give us powerful tools to predict disasters before they happen. Governments and scientists must monitor unstable lakes and glaciers using satellites, sensors, and AI-driven models. These systems can detect early signs of danger, giving communities valuable time to evacuate before disaster strikes. Investing in real-time alerts and community education could save thousands of lives.

Building Stronger Infrastructure

We need to rethink how we design bridges, roads, and power plants. Structures built decades ago were not designed to handle the kinds of extreme weather we’re facing today. Engineers and policymakers must ensure that new infrastructure is flood-resistant and that existing structures are reinforced to withstand future disasters. This kind of investment is expensive, but the cost of doing nothing is far greater.

Preparing for Disasters

Education and preparation can mean the difference between life and death. Governments and communities must train people on emergency evacuation plans and improve international cooperation to respond to climate disasters. Since floods and other extreme weather events are increasing, being prepared is no longer optional—it’s essential.

Addressing Climate Change at Its Root

At the core of these disasters is a warming planet. To slow down glacial melting, we need to cut greenhouse gas emissions. Governments, businesses, and individuals can all play a role by switching to clean energy sources, reducing waste, and advocating for policies that combat climate change. These actions will protect glaciers, and help stabilize global weather patterns.

A Wake-Up Call

The Sikkim flood wasn’t just a freak event—it was a preview of what’s to come if we don’t act now. The good news? We still have time to prepare. By investing in early warning systems, better infrastructure, and climate solutions, we can reduce the risk of future disasters—both in the Himalayas and here at home.

Source: Sattar, A., Cook, K. L., Rai, S. K., Berthier, E., Allen, S., Rinzin, S., Van Wyk de Vries, M., Haeberli, W., Kushwaha, P., Shugar, D. H., Emmer, A., Haritashya, U. K., Frey, H., Rao, P., Gurudin, K. S. K., Rai, P., Rajak, R., Hossain, F., Huggel, C., … Younis Bhat, S. (2025). The Sikkim flood of October 2023: Drivers, causes, and impacts of a multihazard cascade. Science.

How Climate Change Is Affecting Your Favorite Healthy Food Choices

January 12, 2025 / activist360

Close-up of red apples in a basket. The apples Have natural variations in color and texture, showcasing a mix of reddish hues and green patches. Some of the apples have visible blemishes, reflecting their organic and unprocessed state. The lighting is soft and warm, highlighting the rustic and fresh appeal of the apples. Photo by Priscilla Du Preez 🇨🇦 on Unsplash.

Did you know that the apples you enjoy might soon face serious challenges because of rising temperatures?

Apples, one of the most beloved and healthiest snacks, are under threat. As climate change reshapes weather patterns, it’s also impacting how—and where—our food grows. These changes affect not just apples but many of the healthy foods we rely on every day. Understanding this issue is crucial for anyone who cares about their health and the environment. Let’s dive into how climate change is affecting your food.

The Science Behind the Problem

How Climate Change Impacts Agriculture

Climate change is causing shifts in temperatures, rainfall, and weather patterns worldwide. For agriculture, this means disrupted growing cycles, extreme heat, and unpredictable frosts—all of which create challenges for crops. Perennial crops like apples are particularly vulnerable because their growth depends on consistent weather conditions year-round.

Apples as a Case Study

Apples provide a clear example of how climate change affects food production. Scientists have identified six key climate factors that influence apple growth, including:

Extreme Heat Days: Days when temperatures exceed 93°F can cause sunburn on apple skins, reducing their quality.
Warm Nights: Nighttime temperatures above 59°F can prevent apples from developing their rich red color, making them less appealing to consumers.
Reduced Chill Portions: Apples need cold periods during winter to rest and prepare for spring growth. Warmer winters mean fewer of these essential chill hours.
Earlier Frost-Free Days: While this might sound good, it can disrupt the natural bloom cycle, increasing the risk of frost damage later.

Yakima County in Washington, one of the leading apple-producing regions in the U.S., has seen harmful trends in five of these six metrics. These changes reduce apple yield, size, color, and taste—qualities that make apples a staple in healthy diets.

Why It Matters to You

Health Implications

Changes in food production can directly impact your diet. When apples face extreme heat or warm nights, they may lose their flavor and nutritional value. Reduced availability of high-quality apples could make healthy eating more expensive or harder to achieve.

Environmental Concerns

When crops like apples struggle, farmers must use more resources to maintain production. This includes water for cooling trees during heatwaves or energy to run protective equipment. These added measures can increase the carbon footprint of growing food, contributing further to climate change—a cycle that’s tough to break.

Actions Being Taken

Adaptation by Farmers

Farmers are already finding ways to adapt. Here are some strategies being used:

Netting: Covers are placed over apple orchards to protect fruit from sunburn.
Evaporative Cooling: Spraying water on trees helps lower their temperature during heatwaves.
Crop Diversification: Planting heat-resistant apple varieties or other crops reduces risk.

Scientific Research and Innovation

Researchers are also stepping in. A $6.75 million USDA-funded project is helping farmers mitigate extreme climate events. This initiative includes studying how to adapt apples and pears to new growing conditions across the U.S., starting with Washington State. Scientists are working to find long-term solutions that keep crops productive despite challenging conditions.

How You Can Help

Support Sustainable Practices: When you buy apples and other produce, look for labels that indicate sustainable farming practices. Supporting local farmers who prioritize environmentally friendly methods can make a big difference.
Reduce Food Waste: Every piece of wasted food represents water, energy, and labor lost. By planning meals carefully and storing apples properly, you can reduce waste and lessen the strain on farmers already coping with climate challenges.
Advocate for Change: You don’t have to be a farmer to make a difference. Get involved in climate-friendly initiatives or share this information with others. Raising awareness about how climate change affects food can inspire collective action and support for sustainable practices.

Summing Up

Climate change is reshaping how and where our food is grown, with apples as just one example of a crop under threat. The impacts go beyond the farm, influencing your health, your wallet, and the environment. But there’s hope—farmers, scientists, and consumers can work together to protect our environment and food supply.

Source: Preston, S., Rajagopalan, K., Yourek, M., Kalcsits, L., & Singh, D. (2024). Changing climate risks for high-value tree fruit production across the United States. Environmental Research Letters, 19(12), 124092.

Understanding Nature’s Seasonal “Breathing” and the Carbon Cycle in Northern High Latitudes

November 10, 2024 / activist360

Tree in four different seasons: winter, spring, summer, fall.

How Seasonal Shifts in the Northern High Latitudes Impact Global Carbon Levels and Climate Stability

Climate change affects not only temperatures but also how ecosystems manage and cycle carbon dioxide (CO₂). Below we explore how rising temperatures and increasing CO₂ levels in Arctic and boreal regions—collectively called northern high latitudes (NHL)—are creating seasonal shifts in CO₂ levels. These changes impact our planet’s “carbon thermostat” and could intensify global warming if left unchecked. Let’s dive into the drivers behind these changes and how we can use this knowledge to shape a healthier future for our planet.

Defining Seasonal Cycle Amplitude (SCA)

Imagine Earth “breathing” with each season: in the spring and summer, trees and plants in the northern high latitudes absorb CO₂ during photosynthesis, much like an inhale. They use this CO₂ to grow, pulling it from the atmosphere and helping cool the planet. When autumn and winter arrive, these plants release CO₂ back into the air as they decompose—much like an exhale. This seasonal fluctuation in CO₂ is known as the Seasonal Cycle Amplitude (SCA).

Over the last several decades, the “inhale” in summer and “exhale” in winter has become more extreme. Plants are taking in even more CO₂ in warmer months and releasing more in cooler ones. This intensifying cycle is linked to higher CO₂ levels in the air and warming temperatures in the NHL, turning nature’s “breath” into a stronger force in the global carbon cycle.

Primary Drivers of SCA Increase

The increase in the seasonal CO₂ cycle, especially in the NHL, is due to several interacting forces. Here’s a look at the primary drivers behind this intensified “breathing”:

Warming Temperatures: Arctic areas are warming faster than the rest of the world, which means that plants have a longer growing season to capture CO₂. This extended period of photosynthesis results in more CO₂ being absorbed during warmer months.
CO₂ Fertilization: Plants use CO₂ as fuel to grow. With more CO₂ in the atmosphere, plants have more “food” available, which can increase their growth and further boost CO₂ absorption.
Increased Respiration: Warmer temperatures cause more CO₂ to be released back into the atmosphere as organic matter decomposes. This process, called respiration, also happens in winter due to permafrost thaw, releasing even more CO₂.

These factors combined are driving an intensified cycle, making the NHL a more powerful influence on our planet’s CO₂ levels.

Regional Influences

Different regions within the NHL—primarily the Arctic areas of North America and Eurasia—play unique roles in this changing cycle. Here’s how each contributes:

Eurasian Boreal Forests: These forests, especially in Siberia, are major players in absorbing CO₂. Warmer temperatures have enabled these forests to grow longer and stronger, contributing significantly to CO₂ uptake.
North American Boreal Forests: Although North America’s boreal forests are also absorbing CO₂, they are more sensitive to drought. This means they may absorb less CO₂ during dry years compared to Eurasia’s forests, which are often moister due to atmospheric changes.

Differences in forest types, moisture levels, and permafrost also mean that these regions respond to climate change in varied ways, affecting their role in the carbon cycle.

Projections for the Future

Looking ahead, the seasonal cycle of CO₂ is expected to continue intensifying in the NHL throughout the 21st century. Under high-emission scenarios, scientists project that by the end of the century, the NHL’s seasonal CO₂ cycle could be 75% stronger than it was in the 1980s.

What does this mean for global climate? This intensified “breathing” cycle means the NHL will continue to influence Earth’s “carbon thermostat” more dramatically. With higher CO₂ intake in the growing season and increased release during the colder months, this cycle could speed up the warming effects of greenhouse gases on our climate.

Recommendations for the Future

To better understand and manage these changes, scientists recommend several strategies to improve our knowledge of the carbon cycle in the NHL and inform climate policy:

Expand Monitoring Networks: Building more observation stations in under-monitored areas like tundras and Siberian forests will provide a clearer picture of CO₂ dynamics and seasonal trends.
Refine Climate Models: Current models should better account for factors like permafrost thaw and snow cover to accurately predict seasonal CO₂ fluctuations.
Support More Research: Understanding the impacts of landscape changes—such as forest growth, wildfires, and vegetation shifts—will help pinpoint how each factor influences CO₂ release and capture.

Taking these steps will help scientists and policymakers better gauge the impact of NHL ecosystems on the global carbon cycle and adapt climate policies accordingly.

Summing Up

Understanding the “breathing” cycles of the NHL offers a valuable key to shaping our climate future. By integrating more data from these regions, scientists can strengthen climate models, allowing for improved predictions and more precise climate targets. These insights also enhance policy decisions, as a better grasp of Arctic and boreal ecosystem dynamics can guide effective climate policies tailored to address the growing impact of CO₂ levels from these areas.

This seasonal “breathing” of Earth’s northern high latitudes reminds us that even the planet’s most remote areas have a crucial role in our shared climate future. By monitoring and adapting to these changes, we can contribute to a healthier, more balanced Earth.

Source: Liu, Z., Rogers, B. M., Keppel-Aleks, G., et al. (2024). Seasonal CO₂ amplitude in northern high latitudes. Nature Reviews Earth & Environment, 5(11), 802–817. https://www.umt.edu/news/2024/11/110824ntsg.php