Our Physical Environment, Weather & Environmental Degradation
Atmospheric elements, weather recording instruments, tropical rainforest and savanna ecosystems, deforestation, bush burning, and illegal mining (galamsey).
The Ghana Water Company Limited (GWCL) has repeatedly shut down water treatment plants in Kyebi, Bunso, and Sekondi-Takoradi because the turbidity of raw water in the Birim and Pra rivers exceeded treatable limits due to galamsey. Mercury and cyanide used in illegal gold processing enter the food chain, causing neurological disorders and birth defects.
Key Syllabus Learning Objectives
- 1Distinguish between weather and climate and identify standard meteorological instruments
- 2Describe Ghana's major ecological zones and their economic significance
- 3Analyze the causes and catastrophic effects of illegal small-scale mining (galamsey) on water bodies and agriculture
- 4Examine the impact of deforestation and annual bushfires during the harmattan season
- 5Propose sustainable environmental management and land restoration policies in Ghana
Weather Elements, Meteorological Observations & Ecological Belts
- Rain Gauge: Measures rainfall in millimeters; installed in an open area 30 cm above ground level to avoid splash.
- Stevenson Screen: Wooden louvered box painted white and elevated 1.2 m above ground; houses maximum-minimum thermometers and hygrometers shielded from direct solar radiation.
- Ecological Interdependence: Forest zones regulate precipitation through evapotranspiration; clearing them accelerates desert encroachment from the Sahel.
The Ghana Meteorological Agency (GMet) issues daily seasonal forecasts to cocoa farmers in the Western North region to guide planting and fertilizer application schedules.
Accurate weather monitoring and preservation of forest belts are crucial for Ghana's rain-fed agricultural economy.
The Crisis of Galamsey & Bush Burning in Ghana
- Galamsey Impact: Destroys cocoa plantations; pollutes river basins (Pra, Birim, Ankobra, Tano); poisons aquatic life with mercury and lead; creates open death-traps that swallow children.
- Bush Burning Triggers: Careless cigarette butts, hunters smoking out game (akrantie), cattle herdsmen clearing old pasture, and slash-and-burn farming.
- Restoration Measures: Green Ghana Day (planting millions of tree seedlings annually), deployment of security taskforces (Operation Halt), and community river guard surveillance.
The Ministry of Lands and Natural Resources instituted the 'Green Ghana Day', mobilizing students and citizens across the nation to plant over 10 million indigenous trees annually.
Unchecked environmental destruction threatens Ghana's potable water supply and food sovereignty.
- In questions on environmental degradation, distinguish between natural degradation (drought, volcanic ash) and anthropogenic (human-induced) degradation (galamsey, chainsaw logging).
- Do not just state 'water pollution'; name specific impacted rivers (River Pra, River Birim, River Ankobra) and specific pollutants (mercury, silt/turbidity) for top essay scores.
- Remember that the Stevenson Screen is painted white to reflect sunlight and louvered to allow free circulation of air.
- Confusing weather (short-term atmospheric state) with climate (30-year average pattern).
- Failing to link galamsey to high water treatment tariffs and treated water shortages in urban centers.
- Assuming that bush burning only affects northern Ghana, ignoring severe damage in forest-transitional zones like Bono and Bono East.
- Can I name all 7 weather elements and their corresponding recording instruments?
- Do I know the features and location of a Stevenson screen?
- Can I explain 5 devastating consequences of galamsey in Ghana?
- Can I recommend 4 sustainable policy measures to combat deforestation?
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