Why Chemical Mixtures Are Difficult to Regulate
Chemical mixtures are difficult to regulate because most safety laws evaluate substances one at a time, yet real-world exposure involves countless combinations. The sheer…
Topic archive
Pollution & Materials
Overview of how material use and waste contribute to environmental pollution and sustainability challenges.
The Essential-Use Concept for Harmful Chemicals: A Framework for Safer Substitution
The essential-use concept is a policy framework that restricts the use of harmful chemicals to only those applications deemed necessary for health, safety, or…
Neonicotinoids and Pollinator Health: Understanding the Risks and Evidence
Neonicotinoids are a class of systemic insecticides that are absorbed by plants and can contaminate pollen and nectar, posing risks to bees and other…
How Microplastics Move Through Food Webs
Microplastics—tiny plastic particles less than 5 mm in size—enter food webs when they are ingested by organisms at the base of the food chain,…
What Is a Product Environmental Footprint? Definition, Methodology, and Significance
A Product Environmental Footprint (PEF) is a standardized method for measuring the environmental impacts of a product throughout its entire life cycle, from raw…
What Is Remanufacturing? A Complete Guide to the Process and Its Benefits
Remanufacturing is an industrial process that restores used products to like-new condition by disassembling, cleaning, repairing, and replacing components, then reassembling and testing them…
What Is Material Flow Analysis? A Comprehensive Guide
Material Flow Analysis (MFA) is a systematic assessment method that quantifies the flows and stocks of materials within a defined system, such as a…
Mean vs Median in Environmental Data: A Case Study of US Air Quality Index
In environmental data, the mean and median often tell different stories. For US air quality in 2022, the national mean AQI was 48, while…
Territorial Emissions vs Consumption-Based Emissions: A Comprehensive Guide
Territorial emissions account for greenhouse gases released within a country's borders, while consumption-based emissions allocate emissions to the final consumer, including those embedded in…
What Is Embodied Carbon? A Clear and Comprehensive Guide
Embodied carbon refers to the total greenhouse gas emissions generated during the lifecycle of building materials, from extraction and manufacturing to transportation, construction, and…