The D. factor symbolizes the level of economic demand that the population has and it depends on the number of people that inhabit the earth. T stands for the technology used to exploit nature by the people in order to have everything necessary for surviving. The equation is partly correct, but, in fact, it depends mostly on the population, as people tend to influence the environment with their constant evolution. During the early ages, people did not need a great deal of belongings in order to ensure their existence and instead they only needed things that could only take them through the day. Despite that, humans began to prove their superior intelligence with the invention of fire, wheel and other inventions which lead to evolution. Evolution also lead people in creating more favorable conditions of living, thus they could live better and they were able to increase their numbers. As people began to interact, life became easier because...

And T. factors have also been influenced. In spite of the fact that the equation will almost always be correct because that it involves the number of people, different factors can intervene and destabilize the result. At one point, the economic demand of the people will exceed the possibilities of people providing the respective economic help due to the increase in the number of people. Despite the fact that the technology used to exploit nature will evolve, there will be nothing left to exploit because of the fact that people damaged the environment with no regards of the effects that their actions will have in the future.