This process is known as the greenhouse effect, and human activity is a major factor in the rise of the greenhouse gases which cause it.
Furthermore, the number of cars on our streets is growing all the time, and cheap air travel is making flying accessible to more and more people. Consequently, the amount of greenhouse gases released into the atmosphere shows no signs of decreasing.
Firstly, nuclear power is a relatively sustainable energy source, meaning that it can be used to produce electricity without wasting limited natural resources like coal, oil or gas.
With improvements in nuclear technology, the risks of accidents are being reduced. As a result, many countries are now considering nuclear power as a solution to high oil and gas prices, increasing demand for electricity, and worries about pollution and climate change.
Many people decide as young children what they want to do as adults, and it gives them a great sense of satisfaction to work towards their goals and gradually achieve them.
In my experience, very few people who have qualified as doctors choose to change career because they find their work so rewarding, and because they have invested so much time and effort to reach their goal.
Firstly, not everyone dreams of doing a particular job, and it can be equally rewarding to try a variety of professions; starting out on a completely new career path can be a reinvigorating experience.
For example, a positive working atmosphere, enthusiastic colleagues, and an inspirational boss can make working life much more satisfying, regardless of the profession.
People tend to refer to books when they want to research a subject in depth, and for this reason they continue to play an important role in education. On the other hand, books quickly go out of date, and therefore they are not the best medium for communicating news stories.
The main drawback of radio, when compared to books or television, is that there is no visual element; we cannot see what the broadcaster is describing.
The disadvantages of television are that programmes tend to be short and interrupted by advertisements, meaning that information is presented in limited depth.
Nowadays, interactions by email, phone or video are almost as good as face-to-face meetings, and many of us benefit from these interactions, either in work or social contexts. On the other hand, the availability of new communication technologies can also have the result of isolating people and discouraging real interaction.