Product design question

Design a product to fight climate change.

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Ability to scope an enormous, vague problem into one specific, actionable product rather than a broad manifesto.

Narrow the scope, climate change is too broad for one product, so pick a specific lever, reducing household energy waste, and state the assumption.
Identify the target user, homeowners who want to reduce their utility bill and are only secondarily motivated by climate impact.
Identify the core pain point, most people do not know where their home energy is actually being wasted.
Propose the product, a smart plug and sensor system that identifies specific high waste appliances and gives actionable, ranked recommendations with estimated dollar savings.
Define success metrics, measured household energy reduction and, as a secondary metric, estimated carbon reduction per household.

Narrows an impossibly broad prompt to one concrete, testable product, home energy waste reduction, rather than proposing a vague global initiative.
Leads with the user's real, immediate incentive, saving money, using climate impact as a secondary benefit, more likely to drive actual adoption.
Sets a measurable outcome, average percent energy reduction per household, with carbon impact calculated as a derived, secondary metric.

Staying at the level of raise awareness or reduce carbon with no concrete product or mechanism.
Assuming users are primarily motivated by climate concern rather than a more immediate incentive like cost savings.
No metric to measure actual impact, only intent or awareness.

How would you validate that dollar savings actually change household behavior?
How would you scale this beyond homeowners to renters who do not control their utilities?