25 million pounds of beads are distributed every Mardi Gras, leading to environmental concerns

Beads are social currency during Mardi Gras

Historians believe krewes started tossing small items, colloquially called "throws," to onlookers sometime in the 1870s or 1880s. Eventually, shiny beads became the norm and were usually given to those offering something in return. (At times, that meant free booze or the flashing of breasts.) The early strings of beads were glass, though by the 1960s most were plastic.

Mardi Gras has an annual economic impact of nearly $900M

Tulane University's Toni Weiss studies Mardi Gras' effect on New Orleans. Her study of the 2023 parade found that the event generated approximately $891M for the local economy. Weiss also found that the money that the city spent about $10M on the parade (for security, sanitation, and more) but earned a net fiscal benefit of $28M.

Mardi Gras revelers on floats are required to wear masks

Masks are worn to encourage revellers to embrace their wild side without letting their identity get in the way. That's something New Orleans takes seriously: If you're riding on a Mardi Gras float, city law requires that you wear a mask.

During COVID-19, New Orleanians turned their houses into floats

After the 2021 Mardi Gras parades were canceled, New Orleans resident Joy Boudreaux joked on social media that residents should turn their homes into floats. They followed suit and interested (socially distanced) revellers followed maps of participating homes.

Mardi Gras has inspired several songs

New Orleans is a historic music town—with deep-rooted jazz, R&B, and blues traditions, to name a few—so it's no surprise that its annual Carnival has led to more than a few Mardi Gras-themed songs through the decades. One of the most famous is Professor Longhair's 1959 track "Go to the Mardi Gras," an upbeat shuffle that's still played at parades today.

A list of Carnival celebrations from around the world

Mardi Gras might be associated with New Orleans, but cities across the globe also celebrate Carnival with similar festivities. This list breaks down nine of the most popular, including masquerade balls in Venice, Creole celebrations in Cape Verde, and the Battle of the Flowers in France.

New Orleans' Mardi Gras celebration is driven by autonomous 'krewes'

A city ordinance prohibits commercial advertising, and the parade has no central coordinator. Instead, its many activities are organized by individual "krewes"—private clubs of dues-paying members who construct and ride the parades' many colorful floats. The spelling is a faux Old English form of the word "crew," taken from the Mistick Krewe of Comus, who used the stylized language ironically.

Despite Hurricane Katrina, Mardi Gras moved forward in 2006

Although the city had been ravaged by the storm in August 2005 and many of its residents had still not returned by Carnival season in 2006, Mardi Gras celebrations still trudged on, with many krewes' floats and costumes satirizing the fallout from the disaster. Below is a picture by photographers Tyrone Turner and Susan Sterner of one attendee sporting a hazard fence dress.

Mardi Gras blends pagan celebrations with Christian traditions

The holiday has its roots in pagan celebrations, like ancient Rome's Saturnalian and Lupercalian festivals, which celebrated spring and fertility. Rather than abandoning these traditions, Catholic leaders in Rome incorporated their spirit into a celebration that would expel citizens' debauchery in preparation for the sacrifices they'd endure during the Lenten season. Around the world, this holiday season is called Carnival, though the New Orleans version is usually called Mardi Gras.

Research shows that over 1,000 metric tons of microplastics fall on national parks every year—equivalent to 120 million bottles of water.

Most Mardi Gras floats are constructed from foam and papier-mache

The moving sets were originally drawn by mules and made of wood. Now, they're motorized and intricately crafted from foam and papier-mache. This virtual tour of Mardi Gras World—a New Orleans warehouse responsible for floats for various krewes, as well as for Disney and Six Flags—showcases their vibrant designs.

Mermaid tears are a long-lasting and hazardous form of ocean microplastic pollution, whose chemical composition enables them to contain higher concentrations of certain toxins than the surrounding environment.

The first recorded American Mardi Gras was in Alabama

French explorers observed celebrations in what would become the United States in the late 1600s, but the first recognized modern American Mardi Gras took place in Mobile, Alabama, on New Year's Eve, running from 1830 into 1831. By 1840, the town had incorporated costumes, masks, and themes into its parade. After the Civil War, Mobile's Mardi Gras was moved to the more traditional date of Fat Tuesday. By 1850, a group from Mobile migrated to New Orleans, bringing the city's traditions with it.

A taxonomy of Mardi Gras' many krewes

There's more than one kind of krewe in New Orleans. This handy guide breaks down some of the most famous (such as the Krewe of Zulu and the Krewe of Rex) and explains the differences between a "super krewe" and a "walking krewe."

A Mardi Gras alternative takes place in southwest Louisiana

Courir de Mardi Gras, or Cajun Mardi Gras, harkens back to a medieval "feast of begging," when rural French people donned costumes (often mocking the aristocracy) and went from door to door, performing in exchange for gifts.

Pollution from lead battery recycling has led to widespread contamination

Many small-scale operations worldwide remain unregulated, bypassing environmental regulations and causing increasing health threats, primarily to children. A 2020 report by UNICEF found that one-third of the world's children are being poisoned by lead from recycled batteries, among other sources.

The 1977 'SNL' Mardi Gras special is considered the show's biggest disaster

An on-location episode of the then-young sketch show featured drunken heckling from the audience, technical difficulties amid the broadcast, and beads being pelted at cast members.

Louisiana's 'Cancer Alley,' an area with hundreds of industrial plants and petrochemical production, has cancer rates 50% above the national average.

Microplastics have been found everywhere there is liquid or vapor water, from the oceans and tropical waters to polar ice and the air we breathe, posing growing risks to wildlife and ecosystems.

Why it's so hard to end the use of toxic lead

Lead was one of the earliest metals mined on Earth, desired for its soft malleability and used in cosmetics, pipework, gasoline, and more. But even though researchers demonstrated its toxicity in the 20th century, much of the world still uses it.

Research shows that microplastics and nanoplastics can accumulate in major arteries, and patients with these deposits are significantly more likely to suffer heart attacks, strokes, or death.

The prevalence of microplastics came from plastic’s affordability and versatility

Microplastics' durability and overuse have led to massive pollution that overwhelms the planet's ecosystems. Avian, terrestrial, and marine life have been observed to contain microplastics in their bodies, but reverting to paper, cotton, and other materials in manufacturing also brings environmental challenges.

'Mardi Gras' is French for 'Fat Tuesday'

Ash Wednesday, the first day of Lent, requires practicing Catholics to fast. The day before the fast became known as "Fat Tuesday" because it was seen as the last opportunity to indulge before fasting on Ash Wednesday and sacrificing throughout Lent. "Carnival" comes from the Latin for "removal of meat."

Microplastics have been found across all of Earth's depths and altitudes, from plastic debris in the Mariana Trench to fragments found in snow samples near the summit of Mount Everest.

Plastic debris across the ocean aids the spread of invasive species

The durable, long-lasting material can serve as a platform for living organisms to latch onto and ride over vast distances. After the 2011 earthquake and tsunami in Japan, a large dock carrying 100 tons of living organisms native to Japan washed up on Oregon's coastline, confirming the ecological threat.

As of 2025, the FDA states that microplastics have not yet been shown to pose a risk to human health, though it acknowledges that evidence suggests microplastics and nanoplastics have entered the food supply.

Nanoplastics can bypass the blood-brain barrier and may harm the nervous system

Nanoplastics are formed from the breakdown of microplastics and can breach cells. Their large surface area relative to size allows them to carry higher concentrations of forever chemicals than the surrounding environment into sensitive organs.

Scientists have found that sewage sludge used as fertilizer introduces various microplastics into soil, which persist in farmland for decades.

The amount of plastic chemicals in 300 everyday Bay Area foods

Food production is more complicated than it appears, and manufacturing, packaging, and shipping processes can add significant substances to your food. This massive project compiled data on 300 samples of foods delivered to the San Francisco area, testing for the presence of 18 different kind of plastic. Learn how to read the data here with its helpful guides and then explore the table yourself.

King cake is a classic Mardi Gras dessert

One of the signature foods of Mardi Gras is the king cake, a green, gold, and purple-sprinkled desert. Baked inside is a hidden figurine, though some bakers use other objects. Whoever gets the piece with the object is blessed with good luck, though they're also expected to bring a cake to the next gathering.

Synthetic textiles and tires account for more than 60% of ocean microplastic pollution, which enters the seas via runoff and wastewater discharge.

Microplastics are infiltrating the human body with unclear but concerning effects

Scientists have linked microplastics to immune system damage, hormone disruption, inflammatory diseases, and even cancer—yet most of their health impacts remain unknown due to limited research. Studies suggest we ingest about a credit card's worth of plastic weekly.

Microplastics 101: What we know about the contaminants invading our bodies

Fifty-one trillion particles of microplastics float in our oceans. Yet there is very little science of how this affects our health. This quick 2-minute video explains the dangers of microplastics.

After swallowing 23 pieces of plastic, seabirds experience a 90% death rate

Researchers found that this threshold is also met when marine mammals ingest 29 pieces and when sea turtles consume approximately 405 pieces. Almost half of the sea turtles, a third of the seabirds, and one in ten of the marine mammals studied had eaten plastic.

As of 2026, the Great Atlantic Sargassum Belt is the world's largest macroalgal bloom, with seaweed stretching from the Caribbean to West Africa.

The Zulu krewe's coconuts are highly coveted 'throws'

The long-running krewe is known for its finely decorated and highly sought-after coconuts, which it tosses from its floats. In 1987, the group faced lawsuits alleging injuries from its coconut tosses, but the state legislature responded with the "Coconut Bill," which freed the krewe from liability for such claims.

The Love Canal disaster exposed the dangers of buried toxic waste

In the late 1970s, residents of Niagara Falls, New York, discovered their neighborhood was built atop 20,000 tons of chemical waste. Leaking toxins caused illness and birth defects, sparking nationwide outrage and leading to the creation of the EPA's Superfund cleanup program in 1980.

The history behind New Orleans' drive-thru daiquiris

New Orleans attracts millions of annual visitors with its freewheeling drinking culture, reaching its apex during the weeks-long Mardi Gras celebration. But even the most intemperate tourists might be confused by the city's drive-through daiquiri stands. This resource offers a brief history of the quirky staple and explains how it has survived changes in the law.

The challenges of trying to study microplastics in microplastic-abundant labs

The presence of microplastics in instruments, surfaces, and air has made accurate measurement of their levels in lab samples difficult, given the high likelihood of contamination. While the use of stainless steel tools in a sealed, clean lab may reduce accidental exposure, existing methods can misidentify biological substances, such as fat, as plastics, further complicating research.

Explore the UN’s interactive guide to global plastic pollution

Around the world, 1 million plastic drinking bottles are purchased every minute, while 500 billion single-use plastic bags are used worldwide every year. In total, half of all plastic produced is designed to be used only once—and then thrown away.

In Indonesia, microplastics rain down when trash is burned, and people may ingest the equivalent of 3 credit cards per month—on average.

As of 2023, more than 130 nations have enacted bans or restrictions on plastic items, starting with Bangladesh's ban on plastic bags in 2002.

Aerial photos of red tide off the Gulf Coast

The toxic algae grows naturally in warmer oceans in small amounts and is typically harmless. With extended warm periods and unusually-high additions of nutrients from run-off, the algae blooms extensively, posing health risks to wildlife and humans...

When diving and snorkeling in environments containing reefs, avoid touching reefs, anchoring on them, or using sunscreen with active ingredients harmful to marine life.

View the estimated decomposition times for various everyday plastic products, which often fragment into smaller microplastics as molecular bonds are weakened by sunlight.

US labs drain an estimated 500,000 horseshoe crabs of blood each year to harvest a compound that screens vaccines and medical devices for bacterial toxins.

How existing technology could prevent nearly 80% of plastic pollution

More than 28 million tons of plastic enters the environment each year, where it harms animals and damages habitats. A study co-authored by researchers at The Pew Charitable Trusts found that this flow can be reduced by nearly 80% in the next 20 years using existing waste management and recycling technology.

From soil to beer, microplastic pollution is all around us

Marine plastic pollution has been studied for decades, but the extent and effects of plastic pollution elsewhere is only just beginning to be explored.

Supplements often have issues with impurities, toxins, and inaccurate labels

Consumer Reports' tests of more than 20 supplement powders and shakes in 2025 found that more than two-thirds of them contain unsafe levels of lead. Some contained 10 times the amount of lead that's considered acceptable to ingest in a day. The levels they found, in some cases, were even higher than when they tested the products 15 years earlier.

Microplastics are entering human food chains through carrots, wheat, and other foodstuffs grown in farmlands fertilized by sewage sludge.