Of all the renewable energy sources, hydroelectricity is the oldest and most commonly.
在所有的可再生能源中，水电是最古老的，也是最普遍的。
Hydroelectricity uses the force of water flow to produce electricity, so power plants must be over a water source.
水电依靠水流动的力来发电，因此电站必须建在水源之上。
Developments in technology have allowed us to store and send electricity from water power so that it can be used by people not near the power source.
技术的发展允许我们存储和输送水电，因此不住在水电站附近的人们也可以使用它。
In many parts of the world, tentative steps are being taken to introduce these forms of alternative energy.
在世界的许多地方，人们正采取初步措施，来引入此类可再生能源。
For example, some people in Nigeria are training to use solar energy,
例如，尼日利亚的一些人接受训练使用太阳能；
and in Costa Rica, people are now using hydroelectricity to provide power for their small villages.
在哥斯达黎加，人们正在用水电为他们的小村庄供电。
Many of these communities did not have any form of electricity or power before this.
许多社区在使用这些能源以前，没有用过电。
The introduction of programmes like these will hopefully help end the systematic destruction of the environment and see alternative energy promoted around the world.
类似项目的引进将有希望帮助结束对环境的蓄意破坏，在全世界推广可再生能源。
This will mean good things for our future, our children's future and our grandchildren's future.
这对我们及我们子孙的未来意味着好事。