新人教选修六 Unit 4 Global warming[单元课件]

人教新课标选修六

Unit 4Global Warming

The effects of global warming Negative effects:1 cause the sea level to rise; 2 severe storms; 3 droughts; 4 famine; 5 destruction of species 6 flood

The effects of global warming Positive effects:1 make plants grow faster; 2 crops will produce more; 3 make life better

Which is the most important to a country? Money? Technology? Man power? Energy sources? International relations? …

We depend on energy to do many things in our daily lives. For example, energy lights our cities and heats our buildings. Make a list of things that use energy in your home, in your school, or any other places you can think of.

energy sources

cassette player heating light hairdryer video player

micro-wave oven things that use energy stove in your home fridge television computer stove

washing machine

WindmillsWind energy is used as power to produce electricity .

The coal power stations where electricity is produced by burning coals.

in which oil is refined and made pure.

The Oil Refineries

A nuclear power plant

a facility designed to convert nuclear energy into electricity.

Solar panels

on the roof of a house on a bright sunny day are used to collect solar energy, making your house warm or heating your water.

The Hydroelectric dams

are used to keep back water and raise its level for irrigation or for producing electricity, etc.

Discussion An energy source is “renewable” when supplies of it never run out and “non-renewable” when one day they will run out. Which energy sources on your list are renewable and which are non-renewable?

Non-renewableCoal Oil Natural gas Uranium[化]铀 (nuclear energy) 化铀

Fossil fuels

RenewableWind (wind power) Sun (solar energy) Water (hydro-electric power) Plant waste 植物性废物 (biomass energy 生物团能量 ) Hot springs or geysers 间歇泉 (geothermal energy) The sea (tidal energy 潮汐能 )

What are fossil fuels? Fossil fuels are 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. They are also known as non-renewable energy because once they are run out of /run out, they cannot be renewed.