File photo of Lake Tahoe ( Credit: League to Save Lake Tahoe)As millions of Americans fire up their barbecue grills, head to beaches and prepare for fireworks displays this Fourth of July, another annual tradition is quietly taking shape.One of the biggest contributors to the July 4 trash is food. According to ReFED, a US non-profit that studies food waste, Americans throw away more than 120 million pounds of food over the Independence Day weekend. That's about 20 per cent of all the food prepared for the holiday and is worth nearly $400 million.Families buy extra burgers, hot dogs, steaks, snacks and desserts to make sure nobody goes hungry. A little food from one barbecue may not seem like much, but across millions of homes, it adds up to one of the country's biggest annual food waste events.Apart from food, holiday crowds leave after fireworks displays on beaches. One of the examples is Lake Tahoe, where in the year 2024, 402 volunteers spent more than three hours cleaning six popular beaches, nearby streets and parking areas after Independence Day celebrations, according to a News 4 report.By the end of the morning, they had collected 8,559 pounds of litter, the highest amount recorded since the annual "Keep Tahoe Red, White & Blue" clean-up began in 2014.Meanwhile, in Washington state, waste contractor LeMay Grays Harbor removed 84,900 pounds of fireworks debris and rubbish from beaches following Fourth of July celebrations. More than 50,000 pounds came from Ocean Shores alone.The hidden cost of the wasteThe impact of the Fourth of July waste goes far beyond overflowing rubbish bins. Barbecue favourites such as burgers and steaks account for much of the food thrown away, followed by pork, potato chips and ice cream. According to ReFED, beef carries one of the highest environmental costs because raising cattle produces large amounts of methane. The emissions linked to wasted beef during the holiday are estimated to equal the annual electricity use of about 50,000 American homes.Every burger, steak or scoop of ice cream that goes uneaten also represents the water, farmland, fuel and electricity used to produce it. ReFED estimates the water required to grow the food wasted over the holiday could supply residential households across California for around two weeks.The organisation also estimates that the food wasted over the Independence Day weekend could provide two meals for every person experiencing food insecurity in the United States.Even after organised clean-ups end, burnt fireworks, plastic fragments and microplastics often remain buried in the sand or wash into rivers and lakes, where they can continue harming wildlife long after the holiday weekend has ended.Who pays for the clean-up?Once the celebrations are over, the responsibility of clearing up falls on local councils, waste contractors and thousands of volunteers.Communities spend thousands of dollars collecting, transporting and disposing of the extra rubbish generated during the holiday. In some coastal areas, waste has to be hauled hundreds of miles before it reaches landfill, adding to the cost of disposal.Volunteer groups also donate hundreds of hours every year to restore beaches, parks and public spaces before visitors return.