Presentation on theme: "ENERGY. Global Warming The sun is our primary energy source The atmosphere is like an insulator keeping in greenhouse gasses such as CO2, methane, etc."— Presentation transcript:
Global Warming The sun is our primary energy source The atmosphere is like an insulator keeping in greenhouse gasses such as CO2, methane, etc. Greenhouse gasses trap heat and leads to global warming / climate change.
Climate change Greenhouse gases are increasing. Average global temperatures are rising. Climate changes are happening.
An inconvenient truth
Fossil Fuels SA relies heavily on crude oil imported from the Middle East. Crude oil is shipped to Saldanha Bay, north of CT Pumped 120km to the refinery in Milnerton Refined into liquid fuels like petrol, diesel, paraffin and gas Distributed to fuel suppliers
Power plant to plug Most of the electricity in SA is generated near the coal fields of Mpumalanga. Transmission occurs through huge power lines along Eskom’s national grid.
Other fuel types ParaffinWoodLPG
Carbon Footprint Burning coal releases harmful gases into the atmosphere. SO2 + water = acid rain. CO2 = highest contributing global warming greenhouse gas. Methane and other gasses are however much stronger Most of SAs energy comes from burning coal, a fossil fuel
We produce on average 8 tons of CO 2 per person each year in South Africa Coal based electricity “Cheap” electricity Inefficient systems Do you know your carbon footprint? For on-line carbon calculators visit or Carbon Footprint
Renewable or not? Fossil fuels cannot be reproduced or regenerated on a scale that can sustain consumption patterns indefinitely and mostly exist in a fixed amount, such as coal, petroleum and natural gas Renewable energy is energy that comes from renewable resources, such as wind, solar, geothermal, biofuels
Potential energy sources Solar / Sun TW Wind 870 TW Geothermal 32 TW Hydro 7,2 TW Global human energy consumption 15 TW
Solar Power The average home in SA receives 600kWh of sunshine per day The average home uses 774kWh of electricity per month
Solar Water Heating Solar water heaters Electric hot water geysers use 60% of the energy in a home The sun heats water directly and does not create electricity Solar water heaters are costly, but save huge amounts over time
Solar Power (PV) Solar power generation Photovoltaic (PV) cells convert sunlight into electricity This electricity can be stored in batteries and used when required It is however still relatively expensive
Alternative Energy Consider alternative cooking options
Alternative Options Induction stove top
Alternative Options Heat Pump Not renewable, but very efficient for heating and cooling water or air Air-to-water Air-to-air Eskom is currently giving rebates Cheaper than a SWH
Wind Turbines Wind farms produce clean sustainable electricity, but it is an expensive option No pollution No natural resources depleted
Renewable Energy Biofuels can be produced from wheat, corn, potato, sugar cane, etc Spent oil or algae can also be used and has no impact on food security Be aware of concerns around food security
Is nuclear power an option? Koeberg is the only nuclear power station in Africa Power is relatively clean – minimal CO 2 emissions Output is high – one uranium pebble (size of cricket ball) produces as much electricity as (a truck load) 7,6 tons of coal SA is rich in uranium, the core of nuclear fuel, although most of the uranium needed is imported
Nuclear Power Uranium is a non-renewable resource Radioactive waste is highly dangerous It must be buried far underground as it remains active for 1000s of years.
Nuclear Power Uranium is a non-renewable resource Radioactive waste is highly dangerous It must be buried far underground as it remains active for 1000s of years. Remember to tell your grandchildren's children to tell their grandchildren's children, to tell their grandchildren's children, to tell their grandchildren's, grandchildren's, children how to deal with the nuclear waste...
Transport in our City Over 50% of all energy used in Cape Town is spent on transportation - cars, buses, trains and taxis.
Transport in our City How can we reduce our fuel consumption? Lift clubs / car share Use public transport Drive our cars efficiently Buy smaller & efficient cars Consider a hybrid vehicle Cycle or walk
Eco Driving Service your vehicle regularly Check your tyre pressure monthly Remove unnecessary weight from your vehicle Close your windows at higher speeds Use air conditioning sparingly Reduce idling Avoid speeding and drive smoothly When accelerating, change gears as early as possible
Bus Rapid Transport (BRT) The City aims to provide better public transport services
Energy Efficiency The energy efficient house p58
Energy efficient homes
Electricity Safety Check that all electrical wiring is correct and safe Check for gas leaks Make sure your home is well ventilated B L ue is L eft B R own is R ight
Energy saving tips
The challenge: What are you going to do differently? WATER ENERGYBIODIVERSITY WASTE WATERENERGYBIODIVERSITYWASTE