Answer:Improper Waste SegregationProblem: Many people mix biodegradable, recyclable, and harmful waste in just one trash can/bag which making it harder to recycle or dispose of properly.— In science, it helps people to properly do waste segregation using biodegradable bins, color coding, and awareness campaigns. It also helps create composting methods to turn food waste into fertilizer.Plastic PollutionProblem: You can see plastics everywhere and take hundreds of years to break it down, which polluting land and water.— Scientists are creating biodegradable plastics that break down faster. Science also supports recycling technologies to turn used plastic into new products.Overflowing LandfillsProblem: Too much garbage ends up in landfills, causing bad smells, pollution, and health problems. — Science offers waste-to-energy solutions that convert trash into electricity. It also helps design better waste management systems to reduce and reuse waste before it reaches landfills.