Environmental impact of plastic and alternative packaging

Recent research has highlighted complex environmental trade-offs between conventional plastic packaging and biodegradable or paper alternatives. Studies indicate that certain biodegradable materials, such as polylactic acid (PLA) linings in paper cups, may release more microplastics and nanoplastics into hot liquids than conventional polyethylene (PE) linings due to lower thermal stability.

Life cycle assessments suggest that replacing plastic does not inherently reduce greenhouse gas emissions or environmental harm. In South Korea, a study commissioned by the Ministry of Climate, Energy and Environment evaluated four types of straws—conventional plastic, paper, biodegradable plastic, and bio-based polyethylene—across 16 environmental impact categories. The research found that conventional plastic straws outperformed alternatives in 10 categories, including climate change, human toxicity, and particulate matter pollution.

The study highlighted significant risks associated with alternatives: paper straws were found to have a carcinogenic impact 6.33 times higher and roughly twice the acidification impact of standard plastic. Biodegradable plastic showed 3.34 times the carcinogenic impact, while bio-based polyethylene exhibited 16 times the carcinogenic impact.

Furthermore, the research challenged the practical recyclability of paper straws, noting that their small size often causes them to bypass sorting machinery. The use of water-resistant coatings and industrial glues also makes them difficult to break down. Researchers noted that material substitution fails to address fundamental waste management issues, as most straws in South Korea are either incinerated or sent to landfills rather than recycled.