UNIT 10. Human impact in Ecosystems
VOCABULARY
• Overexplotaition• Land occupation• Flood• Draught• Raising• Trapping• Crop• Pest• Hunger• Need• Loss• Greenhouse efect• Landfill• Buried• Burnt
In nature all things are recycled
Recycling….
Water cycle
Biomass cycle
Energy cycle
Humans change everything badly
How?
What have we done?
Pollution Land occupation
Overexploitation
Human impact on the environment
Research: Human impact on the environment
Discuss you understand these terms
Climate change
http://www.epa.gov/climatechange/kids/basics/index.html
Effects of Climate Change
Effects of Climate Change
Effects of Climate Change
http://www.epa.gov/climatechange/kids/
Desertification, drought and
flood
• Desertification is a complex process involving multiple natural and human-related causes. In desertification, the productive potential of arid and semi-arid lands falls by 10% or more, and topsoil is lost or degraded.
– Desertification results mainly from a combination of natural climate changes causing prolonged drought and unsustainable human activities, including overgrazing and deforestation.
Overgrazing on marginal lands (top) can extend
desert zones (lower)
Loss of Biodiversity
Biodiversity is the degree of variation of life forms within a given species, ecosystem, biome, or an entire planet. Biodiversity is a measure of the health of ecosystems. Biodiversity is in part a function of climate.
http://www.novamind.com/connect/nm_documents/285
http://www.novamind.com/connect/nm_documents/285
If anything in your dustbin can be reused by somebody else, recycled or repaired it should notbe there!
Waste is Costly• The earth is a closed system. Matter
amoung keeps constance. There are no losses.
• Any nutrients and resources being taken out of the system (and buried in a landfill, or burnt) are resources lost to us.
Examples….To produce one ton of paper, 100 tons of water are used.For every litre of beer, 10 litres of water have been used in the fermenting process.Producing one cellphone requires 75 kg of resources.A toothbrush requires 1,5 kg of resources – coal, oil and water – for its production
Recycling…
Benefits of recycling• reduces the amount of waste going into
landfill sites, saving airspace;• creates jobs and money for schools and
organisations• reduces pollution and litter;• saves raw materials needed to make new
products• reduces the need to import expensive
raw materials
Benefits of recycling• slows down the use of the world’s
non-renewable (oil, coal and iron) and renewable resources (trees)
• reduces energy costs in manufacturing of containers, packaging, etc.
• saves water (used in packaging and product manufacture). Recycling paper uses 50% less water than paper that is made from wood pulp.
1)Why can we say Nature is continuously recycling?
2)Which are the main points to be considered in human impact on the environment?
3)Write five actions to make a contribution to solve global warming
4)Describe in your owm words, the human contribution to the desertification
5)Give three reason to practise the recycling that you can do in your diary life