Global warming Unit 4

What causes the global warming? Human activity or a random but natural phenomenon? Think about:

When we talk about this problem, we naturally link it to the use of energy and the environmental pollution. But firstly and importantly, energy makes a great difference to our lives. What things do we use energy for?

Things that use energy around us or at any other places: Where does all this energy come from?

From the following pictures, you will know where all this energy comes from. windmillsa coal power station

an oil refinery a nuclear power plant

solar panelsa hydro-electric dam

Fossil fuel ( 化石燃料 ) : Ancient animal and plant material below the surface of the earth with a high carbon content, such as coal, oil and natural gas, which can be burnt to produce energy; also known as non-renewable energy because once they are used they have gone forever; they cannot be renewed. What are fossil fuels?

Sample lists Things that use energy Sources of energy Renewable / non-renewable light heating television cassette player video recorder oil coal natural gas wind (wind power) sun (solar energy) renewable renewable non-renewable non-renewable non-renewable

fridge stove washing machine hair- dryer water( hydro- electric) renewable plant waste (biomass energy) renewable hot springs or geysers (geothermal energy) renewable the sea (tidal energy) renewable computer uranium (nuclear energy) non- renewable

Renewable or non-renewable? √

Renewable or non-renewable? √

Carbon dioxide coal oil natural gas global warming ● ● ● ● ● ●● ● ● ● ● ● Why? Fossil Fuel

A greenhouse

is made of _______ and is used for growing ________, especially during _____ weather. What is a greenhouse made of and used for? glass plants cold

The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so the plants can grow throughout the cold period. How does a greenhouse work?

Now can you connect global warming with greenhouse and think of the relationship between them? Maybe you can understand why we call global warming “greenhouse effect”.

Greenhouse effect

The greenhouse effect is a naturally occurring process that aids in heating the Earth's surface and atmosphere. It results from the fact that certain atmospheric gases, such as carbon dioxide, water vapor, and methane, are able to change the energy balance of the planet by absorbing longwave radiation emitted from the Earth's surface. Without the greenhouse effect life on this planet would probably not exist.

“ 低碳生活 ” (low-carbon life) “ 低碳生活 ”(low-carbon life) ，就是指 生活作息时所耗用的能量要尽力减少， 从而减低碳，特别是二氧化碳的排放 量，从而减少对大气的污染，减缓生 态恶化，主要是从节电节气和回收三 个环节来改变生活细节。

Save energy! Protect the earth!