A city's population stays nearly constant, but its total carbon footprint increases over several years. Which change best explains this pattern?

A student lives close enough to school to travel by bicycle safely. How would choosing a bicycle instead of riding alone in a gasoline-powered car most directly reduce the student's carbon footprint?

A school cafeteria sends large amounts of uneaten food to a landfill. Which explanation best connects this practice to the school's carbon footprint?

Four households use the same amount of electricity. Which household is likely to have the smallest carbon footprint from electricity use?

A growing community wants to meet the needs of more residents without greatly increasing its carbon footprint. Which plan best addresses both population growth and per-person consumption?

A company claims that replacing disposable water bottles with refillable bottles will reduce carbon emissions. Which evidence would best support this claim?

Why can high consumption of newly manufactured products increase a person's carbon footprint even if the products do not burn fuel while being used?

Study the graph comparing two communities. Which statement best explains the difference in their total annual carbon emissions?

The diagram shows changes a neighborhood made during one year. Which change most directly explains the largest reduction shown in the neighborhood's carbon emissions?