Human causes of climate change
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Flip to reveal answersName the two main greenhouse gases from human activity.
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All 11 Flashcards — Human causes of climate change
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Question
Name the two main greenhouse gases from human activity.
Answer
**Carbon dioxide (CO2)** and **methane (CH4)**.
Question
Define a greenhouse gas.
Answer
A gas that traps heat in the atmosphere, warming the Earth.
Question
What is the enhanced greenhouse effect?
Answer
Extra warming caused by **human-added** greenhouse gases on top of the natural effect.
Question
Define albedo.
Answer
How reflective a surface is — bright surfaces reflect sunlight (high albedo), dark surfaces absorb it (low albedo).
Question
Give two human sources of CO2.
Answer
**Burning fossil fuels** (energy, transport, industry) and **deforestation**.
Question
Give two reasons methane is rising.
Answer
More **livestock** (cattle) and more **rice farming**; also fossil-fuel leaks and landfill.
Question
How does building a city change albedo?
Answer
Dark tarmac and roofs **lower** albedo, so more sunlight is absorbed and the surface warms.
Question
How can expanding trade raise emissions?
Answer
More export manufacturing burns more fuel (CO2) and more long-distance shipping/flying adds emissions.
Question
Why can economic development raise OR lower emissions?
Answer
Early growth adds industry and cars (rise); later, wealthy economies can afford clean energy and services (fall).
Question
Data command term: what does 'State' require?
Answer
Read the value **straight off** the graph or table — no explanation needed.
Question
How does deforestation cause warming?
Answer
It removes trees that absorbed CO2, and burning them releases stored carbon.
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Topic 2.1 hub
Causes of global climate change
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