Pollution

The Caribbean’s sandy beaches, clear turquoise water and vibrant coral reefs filled with an amazing variety of sea creatures have long been the pride of the islands. The big three – sun, sea and sand – have made this tropical paradise the most tourism-reliant region in the world. But now, all of that is under threat. The explosive growth of a type of seaweed called sargassum is wreaking havoc on economies, coastal environments and human health across the islands. I study the intersection of critical infrastructure and disasters, particularly in the Caribbean. The sargassum invasion has worsened since it exploded in the region in 2011. Forecasts and the seaweed already washing up suggest that 2024 will be another alarming year. Sargassum levels were already high around many eastern Caribbean islands in late May 2024. Forecasters expect increasing sargassum washing up in June on many of the islands and in the Gulf of M...

The intersection of Fort Street and Oakwood Boulevard in southwest Detroit today functions mostly as a thoroughfare for trucks and commuters. However, as you sit idling at the stoplight waiting to cross the bridge over the Rouge River, you might glance to the side and see something unexpected in this heavily industrialized area: A sculpture of weathered steel reaches toward the sky alongside a spray of flowers and waves of grasses and people fishing. This inconspicuous corner, now the home of the Fort Street Bridge Park, has several stories to tell: of a river, a region, a historic conflict and an ongoing struggle. If you pull over, you’ll enter a place that attempts to pull together threads of history, environment and sustainable redevelopment. Signs explain why this sculpture and park are here: to honor the memory of protesters who met on this very spot on March 7, 1932, before marching up Miller Road to the massive Ford Rouge River Complex located in the adjacent c...

When people talk about the “Anthropocene,” they typically picture the vast impact human societies are having on the planet, from rapid declines in biodiversity to increases in Earth’s temperature by burning fossil fuels. Such massive planetary changes did not begin all at once at any single place or time. That’s why it was controversial when, after over a decade of study and debate, an international committee of scientists – the Anthropocene Working Group – proposed to mark the Anthropocene as an epoch in the geologic time scale starting precisely in 1952. The marker was radioactive fallout from hydrogen bomb tests. On March 4, 2024, the commission responsible for recognizing time units within our most recent period of geologic time – the Subcommission on Quarternary Stratigraphy – rejected that proposal, with 12 of 18 members voting no. These are the scientists most expert at reconstructing Earth’s history from the evidence...

Flowers grown on inexpensive floating platforms can help clean polluted waterways, over 12 weeks extracting 52% more phosphorus and 36% more nitrogen than the natural nitrogen cycle removes from untreated water, according to our new research. In addition to filtering water, the cut flowers can generate income via the multibillion-dollar floral market. In our trials of various flowers, giant marigolds stood out as the most successful, producing long, marketable stems and large blooms. Their yield matched typical flower farm production. Why it matters Water pollution is caused in large part by runoff from farms, urban lawns and even septic tanks. When it rains, excess phosphorus, nitrogen and other chemicals wash into lakes and rivers. These nutrients feed algae, leading to widespread and harmful algae blooms, which can severely lower oxygen in water, creating “dead zones” where aquatic life cannot survive. Nutrient runoff is a critical issue as urban areas expand,...

Canada’s air pollution levels last year were worse than those in the United States for the first time since an air quality firm in Switzerland started publishing its assessments in 2018. The sixth World Air Quality report published Tuesday by Goldach, Switzerland-based IQAir says raging wildfires were a major influence on Canada’s drop in air quality in 2023, The Canadian Press reports. While the report found Canada on average still has some of the least polluted air, public health experts have repeatedly warned about the health dangers of more intense wildfire seasons, fuelled by human-caused climate change. “Air pollution is a silent killer,” said Dr. Samantha Green, a family physician with Unity Health Toronto and associate professor at the University of Toronto who was not involved with the report. “It’s a problem that I think we’re not used to thinking about, but that we need to be thinking about more.R...