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     * Ligne n°9 : * Renewable energy sources
     * Ligne n°10 : * Non-renewable energy sources
     * Ligne n°24 : Renewable energy sources
     * Ligne n°36 : Non-renewable en. sources
     * Ligne n°91 : We can divide renewable energy sources into two main categories:
     * Ligne n°92 : traditional renewable energy sources like biomass and large hydropower
     * Ligne n°93 : installations, and the "new renewable energy sources" like solar
     * Ligne n°94 : energy, wind energy, geothermal energy, etc. Renewable energy sources
     * Ligne n°100 : energy sources" produce only 2.4% of overall world energy. 1.3% are
     * Ligne n°104 : sources is decreasing with time, and their damaging influence has
     * Ligne n°108 : fact shows us that we should exploit renewable sources much more and
     * Ligne n°110 : to exist. Development of renewable energy sources (especially from
     * Ligne n°113 : * Renewable energy sources have major role in decreasing of
     * Ligne n°115 : * Increased proportion of renewable energy sources enhances
     * Ligne n°119 : * It is expected that renewable energy sources will become
     * Ligne n°120 : economically competitive to conventional energy sources in middle
     * Ligne n°127 : energy sources. The main problem concerning new installations is
     * Ligne n°130 : to other, commercially more available sources of energy. Large part of
     * Ligne n°131 : energy production from renewable sources is a result of population
     * Ligne n°135 : of renewable energy sources from year 2003 till the year 2010. This
     * Ligne n°136 : means that renewable energy sources maximum quantity would enlarge up
     * Ligne n°139 : transform renewable energy sources in to a useable energy (mostly
     * Ligne n°141 : another ambitious goal to increase share of renewable energy sources
     * Ligne n°147 : Most interesting renewable energy sources ( wind energy, Sun energy,
     * Ligne n°150 : majority of renewable energy sources, but there's also couple of
     * Ligne n°151 : sources that do not originate from Sun. These are geothermal energy
     * Ligne n°167 : different technologies were developed. Advantage of this energy source
     * Ligne n°168 : is that is cheap, stable and durable source, there is no need for the
     * Ligne n°203 : of places suitable for using this energy source. The most famous power