As we all know that population is increasing day by day in india as well as world wide also, along with this energy needs are also increasing. So their is an essential need of introducing the sources of energy which are renewable as well as can fulfill future needs. In order to cop up with this situation many innovations are taking place.
Two of them are - - -
1)Solar Tree
2)Luminary swing
Firstly, SOLAR TREE is a decorative means of producing energy and electricity. It has multiple panels which act as a leaves of tree and provide light or energy as a fruit of tree. Thus it is an effective way as it has multiple functioning as it provide light during night, act as a decorative big size showpiece and is designed in such a way that it can be installed in public places which can help in round group sitting also. It is useful as it requires less land and provide more energy, unlike the solar power plants which requires a huge space, this was designed in 2012 by ROSE LOVEGROVE. It is the best innovation for countries with more population. A big thanks to Rose Lovegrove who designed it. Thus many countries are planning to install this. As it can be installed in public places.,also in remote places and villages as it has the capability to provide electricity to 5 houses and can work for three days in a cloudy weather. In conclusion - - to fulfill the increasing energy demand and to save land this is very successful.
Secondly, LUMINARY SWING is a very attractive design of a swing which provide three facilities in a single thing. It is designed for the parks. This swing is consist of a solar panel, a swing for childrens to play and a slot for charging purpose.It works in such a manner that when a child takes a swing the system installed will work and will produce electricity. The solar light will lighten up the park in night and the process by swing helping in producing electricity will help the visitors to charge their mobile. Thus overall it an appropriate swing designed to be installed in parks. 
These two designs are the best way to conserve energy and they require only the cost of installation than it works by itself for many years.Thus it is also good as it causes no air pollution and requires less land which is the basic need of future.
For people also they provide a moral value that - - like them as like a tree which provides fruit without expecting anything in return from we humans,we should always behave good with others and should always do a good deed without expecting anything in return from that fellow humans. As all can't be as talented as a tree.
At last I would like to say that this is one of the best topic of science from the point of view of presentations and seminars for students.