Climate Change Waste Management & Recycling 2 — Questions and Answers
Question 1: What percentage of municipal solid waste in the US is currently recycled or composted?
- About 10%
- About 32% (Correct answer)
- About 55%
- About 70%
Correct answer: About 32%
The US recycles or composts approximately 32% of its municipal solid waste, according to EPA data.
Question 2: Which gas produced by landfills is a potent greenhouse gas that can be captured for energy?
- Carbon dioxide
- Nitrous oxide
- Methane (Correct answer)
- Sulfur dioxide
Correct answer: Methane
Landfills produce methane as organic waste decomposes anaerobically, and many facilities capture it to generate electricity.
Question 3: What is 'downcycling' in the context of recycling?
- Recycling materials into higher-quality products
- Converting waste into energy by incineration
- Recycling materials into lower-quality products (Correct answer)
- Sorting recyclables by weight
Correct answer: Recycling materials into lower-quality products
Downcycling refers to recycling a material into a product of lesser quality or utility than the original, such as turning plastic bottles into carpet fiber.
Question 4: Which waste management approach is considered the most environmentally preferred according to the EPA waste hierarchy?
- Recycling
- Landfilling
- Source reduction and reuse (Correct answer)
- Waste-to-energy incineration
Correct answer: Source reduction and reuse
The EPA's waste management hierarchy places source reduction — producing less waste in the first place — at the top as the most preferred approach.
Question 5: Electronic waste (e-waste) is a climate concern primarily because it contains what?
- High concentrations of CO2
- Toxic heavy metals and valuable rare materials requiring energy-intensive extraction (Correct answer)
- Large amounts of methane gas
- Highly flammable organic compounds
Correct answer: Toxic heavy metals and valuable rare materials requiring energy-intensive extraction
E-waste contains toxic heavy metals like lead and mercury plus rare materials that require enormous energy and mining to replace if not recovered.
Question 6: What is 'extended producer responsibility' (EPR) as it relates to waste reduction?
- A law requiring consumers to sort all waste
- A policy holding manufacturers responsible for the end-of-life management of their products (Correct answer)
- A tax on single-use plastics paid by retailers
- A recycling program funded by municipal governments
Correct answer: A policy holding manufacturers responsible for the end-of-life management of their products
EPR policies shift responsibility for product disposal from taxpayers and municipalities to the manufacturers who design and sell products.
Question 7: How does food waste in landfills specifically contribute to climate change compared to composting?
- Landfill food waste releases CO2 while composting releases methane
- Landfill food waste releases methane while composting produces stable carbon compounds (Correct answer)
- Both produce equal greenhouse gas emissions
- Landfill food waste breaks down harmlessly while composting releases nitrous oxide
Correct answer: Landfill food waste releases methane while composting produces stable carbon compounds
Food waste in oxygen-deprived landfills decomposes anaerobically and releases methane, while composting breaks down organics aerobically into stable, soil-enriching carbon.
Climate Change Waste Management & Recycling 2
What percentage of municipal solid waste in the US is currently recycled or composted?