2. Read the passage carefully and answers the questions below.
Energy is essential to human beings, especially to poor people - the one-third of humanity that does not have
modern energy supplies like electricity, with which their life could be improved.
Many people who live in the countryside have to gather wood. This takes a lot of time. Moreover, it causes
indoor air pollution because of heavy smoke. For many people living in rural areas in developing countries of the
world, biogas is the large energy resources available and costs almost nothing. The main use of biogas is for
cooking and heating. As biogas is smoke-free, it helps solve the problem of indoor air pollution. Moreover, plant
waste and animal manure cost almost nothing.
The tendency to use renewable energy sources is on the increase when non-renewable ones are running out. In
the coming years, people in the developing countries may use wind or sea waves as the environment-friendly
energy sources.
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