1. What type of city is Curitiba?
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2. What is grey in the colour-coded system?
- express- few stops, quick
- suburbs - express
- suburbs - centre
- outline - express
3. How tonnes of rubbish is collected each month from the green exchange?
- 30 tonnes
- 300 tonnes
- 3000 tonnes
4. What is the green exchange?
- people who are 'green' get rewarded
- people separate and collect their rubbish in exchange for green belt products
- people separate and collect their rubbish to receive green plants
5. When was the green exchange started?