Correct answer: A

The correct answer is Warming caused when atmospheric gases absorb and re-emit outgoing infrared radiation.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Greenhouse gases naturally retain some outgoing infrared energy; human activities can increase this effect.
3. Connect evidence to impact: The correct answer is Warming caused when atmospheric gases absorb and re-emit outgoing infrared radiation.

Correct answer: B

The correct answer is The fraction of incoming radiation reflected by a surface.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Bright surfaces such as snow have high albedo and reflect more energy than dark surfaces.
3. Connect evidence to impact: The correct answer is The fraction of incoming radiation reflected by a surface.

Correct answer: C

The correct answer is Reducing the causes of climate change, such as greenhouse-gas emissions.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Mitigation addresses the drivers of climate change through efficiency, clean energy, conservation, and other measures.
3. Connect evidence to impact: The correct answer is Reducing the causes of climate change, such as greenhouse-gas emissions.

Correct answer: D

The correct answer is Adjusting systems and communities to reduce harm from climate impacts.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Adaptation includes heat planning, resilient infrastructure, water management, and other responses to expected impacts.
3. Connect evidence to impact: The correct answer is Adjusting systems and communities to reduce harm from climate impacts.

Correct answer: A

The correct answer is Wind energy.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Wind is replenished by atmospheric processes on a human time scale, unlike fossil fuels.
3. Connect evidence to impact: The correct answer is Wind energy.

Correct answer: B

The correct answer is They form over geological time much more slowly than humans consume them.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Coal, oil, and natural gas require very long geological processes, so their usable reserves are finite on human time scales.
3. Connect evidence to impact: The correct answer is They form over geological time much more slowly than humans consume them.

Correct answer: C

The correct answer is Environmental impacts of a product or process from raw materials through use and disposal.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Life-cycle assessment considers resource extraction, manufacturing, transport, use, and end-of-life impacts.
3. Connect evidence to impact: The correct answer is Environmental impacts of a product or process from raw materials through use and disposal.

Correct answer: D

The correct answer is The biologically productive area needed to support resource use and absorb wastes.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: An ecological footprint estimates the demand a population places on Earth's productive ecosystems.
3. Connect evidence to impact: The correct answer is The biologically productive area needed to support resource use and absorb wastes.

Correct answer: A

The correct answer is Overuse of a shared resource when individuals gain from use but costs are distributed.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Without effective rules or cooperation, shared resources such as fisheries or grazing land can be depleted.
3. Connect evidence to impact: The correct answer is Overuse of a shared resource when individuals gain from use but costs are distributed.

Correct answer: B

The correct answer is The amount of a renewable resource that can be harvested without reducing its long-term availability.

1. Identify the environmental science concept: Determine whether the question concerns ecosystems, cycles, populations, pollution, climate, resources, conservation, policy, or environmental health.
2. Apply the systems principle: Sustainable management keeps extraction at or below the rate of natural replacement under stated conditions.
3. Connect evidence to impact: The correct answer is The amount of a renewable resource that can be harvested without reducing its long-term availability.