Riverton compared two plans: a curbside recycling program and new shade trees on Main Street. The town's goal is sending less trash to the landfill. Which plan meets that goal?

Lakeside built a rain garden of deep-rooted plants beside a parking lot. Rain that once ran straight into the creek now soaks into the ground. What problem does this address?

Millport is choosing between restoring its marsh and lining the stream with concrete. The goal is to slow floodwater and filter runoff. Which plan meets both parts of the goal?

Ashville limited lawn watering and cut summer water use by 30%. Brookton only asked residents to save and cut use by 8%. Which evidence best supports the claim that the rule worked better?

Milltown must filter runoff into Mill Creek with $50,000 by December. Plan A restores the old marsh beside the creek: $80,000, ready in November. Plan B plants deep-rooted grass along the bank: $40,000, ready in October. Which plan fits both limits?

Fairhaven installed rain gardens two years ago to keep dirt out of Mill Creek. Which observation best supports the claim that the rain gardens are meeting that goal?

A city can either collect its used aluminum cans for recycling or bury them and dig up new ore to make more cans. The goal is to use up less of the metal stored in the ground. Which choice meets that goal, and why?

A school wants to send less food waste to the landfill, so students start a compost bin for scraps and dead leaves. What happens to that material instead?

Riverton's goal is to keep fertilizer out of its river. Leaving a strip of deep-rooted grass along the bank helps the town meet that goal.

Elmwood wants to cut the number of plastic water bottles its school throws away. It can put in refill stations for reusable bottles or buy bigger trash cans. Which plan meets that goal, and why?

Marden drinks fresh water pumped from wells under a grassy field. The town is choosing between keeping that field as an open grass buffer or paving it for a wider road. The goal is to keep the well water clean. Which plan meets that goal, and why?

Greenview planted trees on a bare hillside above its reservoir to keep mud out of the water. How does planting trees meet that goal?

A city is weighing two plans to lower air pollution from cars: a free downtown bus line, or a wider highway. Which plan better meets that goal, and why?

Brookton put solar panels on its school roof, so the school now buys less electricity from a power plant. Which problem does this choice address?

Hillcrest tried a plastic bag rule in one neighborhood for a year. Which comparison would best show whether the rule met its goal of fewer bags in the creek?

Greenfield replanted native grasses in a field where mining had stripped away the soil. Which kind of choice is this?

Northgate is choosing between adding parking spaces downtown and adding a bike lane along the main road. The goal is to cut the number of car trips downtown. Which plan meets that goal, and why?

Stonebridge must cut the mud reaching its reservoir within two years, and can spend $30,000. Plan A terraces the hillside: $25,000, done in 18 months. Plan B builds a settling tank: $45,000, done in 10 months. Which plan fits both limits?

Two years ago Westfield began sweeping its streets every week to keep grit out of the storm drains. Which observation best supports the claim that the sweeping is meeting that goal?

A town can either repair the leaks in its old water pipes or drill a second well into the same underground supply. The goal is to make the underground water last longer. Which choice meets that goal, and why?