Yes. Sun is the ultimate source of energy. Directly or indirectly all forms of energy are got from solar energy examples are discussed below:
(i) Fossil fuels are formed due to the burial of plants and animals.
(ii) Renewable sources of energy are also got indirectly from the sun as follows.
(a) The water in lakes, rivers, evaporates due to solar energy and forms clouds. This brings rainfall.
(b) Wind energy is due to uneven heating of earth's surface by the sun rays.
(c) Solar energy is dependent on sunlight directly.

Reena can grow plants in her house in pots. She can talk to the other residents and have terrace garden. The Government has brought in lot of seeds / manures in subsidized rates to promote terrace gardening.

There are companies who are doing e-waste management an a commercial scale. Therefore organizations which generate a lot of e-waste must not throw the same in garbage bins but channelise the e-waste through the organizations meant for the same.

Car pooling is an initiative being advocated to the public because more people can make use of a vehicle. It has multiple uses like Judicious use of fuel, reducing traffic congestion and so on. Further it is also economic for the users. Thus car pooling is a eco friendly initiative which can save resources for the future generation. It is not linked to the economic status of an individual.

The various devices used for harvesting sun's energy are called solar energy devices.
Solar cells:
(i) Solar cells (Photovoltaic devices) is made up of silicon that converts sunlight directly into electricity.
(ii) Solar cell produces electricity without polluting the environment.
(iii) Since it uses no fuel other than sunlight, no harmful gases, no burning and no wastes are produced. These can be installed in remote and inaccessible areas (forests and hilly regions) where setting up of power plant is expensive
Uses of Solar cells:
(i) It can be used for street lighting, traffic signals, water pumping, battery charging system etc.
(ii) It is used in artificial satellites and space probes.
(iii) It provides radio and TV transmission to remote areas
(iv) It is used in calculators, electronic toys and watches.