a) One such example is a solar panel which could charge an LED lamp to create hours of light each day.

b) In addition to being fairly costly, these create smoke pollution and carbon emissions.

c) Therefore, alternatives are being investigated.

d) A result of not being connected to the electricity grid in rural areas of some countries means people light their homes using kerosene lamps.

a) The fear of criticism from colleagues, friends and family is the main factor that obstructs a change in their employment situation.

b) However, most of these workers would not consider career alternatives.

c) It seems that the lack of psychological reward is the reason for their dissatisfaction.

d) Despite the financial stability a high salary brings, research has shown that the majority of top earners are not happy in their jobs.

e) Interestingly, it is not the risk of a decrease in salary which prevents this move.