World at Risk

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Reasons for deforestation in developing countries
1) Clear space for farming 2) Clear space for biofuels
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How urban growth can lead to more people being at risk from flooding
Expanding the area of impermeable surfaces increases overland flow and decreases groundwater flow. Decreased vegetation cover which reduces interception. Drain pipes & sewers accelerates water flow towards rivers, increasing the risk of flash floods.
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Explain how sunspot variations are linked to past climate changes
High number of sun spots increases sun's radiation output, caused by intense magnetic activity on the sun's surface, medium term trends in sunspots have been linked to cooler climates in the past e.g. Little Ice Age
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Why some evidence for climate change is incomplete and unreliable
Scientific methods may have been unreliable, e.g. early telescopes for sunspots, subjective nature of proxy data sources from pictures e.g. Thames frost fairs, tree rings records extends back only about 8000 years, and is regional not global.
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Human factors that contributes to rising food insecurity for vulnerable people
Civil war, population growth, rising poverty, rising food prices, land degradation, global warming
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How hazards caused by El Nino events can lead to food shortages
Drought in Australia leads to crop failures and damage to crops from wildifres, heavy rain leads to flooding in Peru, destroys crops.
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How global warming can affect food supplies in Africa
Increased drought leads to crop failure,
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Other cards in this set

Card 2

Front

How urban growth can lead to more people being at risk from flooding

Back

Expanding the area of impermeable surfaces increases overland flow and decreases groundwater flow. Decreased vegetation cover which reduces interception. Drain pipes & sewers accelerates water flow towards rivers, increasing the risk of flash floods.

Card 3

Front

Explain how sunspot variations are linked to past climate changes

Back

Preview of the front of card 3

Card 4

Front

Why some evidence for climate change is incomplete and unreliable

Back

Preview of the front of card 4

Card 5

Front

Human factors that contributes to rising food insecurity for vulnerable people

Back

Preview of the front of card 5
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