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FIGURE 1.1 Limits of growth.

You can see that with 30 years of data, pollution, industrial output, population, and services per capita are all increasing as expected. At the same time, the remaining non-renewable resources are decreasing a little slower (good), but food per capita is increasing a little faster than expected (bad).

      The study was also concerned with sustainable development, which was defined by the notion that the developed nations can keep what they have while the poor people try to catch up. Or perhaps, keep on doing what we are all doing but through technological advances, we can expect less pollution and use fewer resources. Unfortunately, we are not succeeding with this expectation. We are currently consuming 70% more than what the earth is able to provide as explained earlier by the ecological footprint.

What we are consuming can be described as the different forms of industrial capital. This capital really refers to the machines and factories that produce the manufactured goods. These products manufactured by the industrial capital can be defined as industrial output. This industrial output derived from industrial capital can be used to generate service capital for the service industry, like banks, schools, and hospitals, which provide services for the people. Industrial capital is also converted to agricultural capital to generate agricultural output. Likewise, it is converted to resource-obtaining capital to generate resource output. In addition, industrial capital is used to manufacture consumer goods. As each of these industrial outputs continues to grow, there is a need for more capital to be invested in the factories and machines that serve each of the outputs. Consequently, there may be an exponentially growing requirement for industrial output to expand the capacity for production in the future. This leads to more and more consumption.

CONSUMPTION FACTOR

      Another way of looking at overuse of the earth's resources is to talk about consumption. There is a great variation today in consumption of the many nations in the world. Consumption is defined as the needs of people for survival in terms of food, energy, materials, and the disposal of waste. The disparity in the consumption rate is that it is 32 times greater in the United States, Canada, Western Europe, Japan, and Australia than in the developing countries [11].

      In 2019, the world population is estimated to be around 7.7 billion people of whom only about 1 billion live in the fully developed countries listed earlier. By the middle of this century, it is estimated that the world population could grow to 9 billion people, and there are questions as to whether the earth can support this number of people or will it collapse. It is not really a question of how many people are on this earth, but what is the consumption rate of these people?

      People in third-world countries are aware of a major difference in the consumption rate per capita, although they probably don't know the magnitude of the difference. In general, their goal is to catch up to the developed countries, but if they believe their chances of catching up are hopeless, they could get frustrated, angry, or even participate in terrorist activities. Another option is to immigrate to a first world country like the United Stated and Western Europe, but then they would contribute to the consumption rate of that country.

If one considers the fastest growing economy in China, these people are already aspiring to increase their consumption to the 32 factor. If the Chinese were to succeed, it would be equivalent of doubling the world's consumption rate. If India were to do the same thing, the consumption rate would then triple. If the entire world had the same consumption rate as these first world countries, it would be the same as having 72 billion people on this planet at the current consumption rates—and there is no way the earth could handle this.

      Since we are in no position to restrict the rest of world from improving their quality of life, the only answer is that the high consuming countries mentioned earlier must lower their consumption rate. But will they do it for the benefit of the rest of the world? Whether they want to or not, they must reduce their consumption rate because what they are doing today is not sustainable.

      If these countries reluctantly agree to reduce their consumption rate, does it mean that they will have to reduce their quality of life? Definitely not! For example, the people in Western Europe consume half as much oil (gasoline) per capita than the people in the United States. But the Western European standard of living is considered higher than that in the United States in terms of life expectancy, healthcare, infant mortality, vacation time, quality of public schools, and several other criteria. Does a large gas-guzzling automobile really contribute positively to any of these quality-of-life factors? Probably not!

      The current state of the environment can also be presented by looking at four major environmental issues: (i) water scarcity, (ii) energy sources, (iii) climate change, and (iv) population growth.

CONSERVATION OF WATER

Water is a natural resource with a finite quantity. The amount of water on this planet 2000 years ago is the same as it is today, but the population during this time interval has gone from approximately 150 million to over 7 billion. But of all the water on the earth, how much is readily available to all of the living creatures? Figure 1.2 [12] provides a summary of the current situation.

The earth's surface is about 71% water; however, 97% of all the water on earth is saline. Of the remaining 3%, 68.7% is in the form of icecaps and glaciers, 30.1% is ground water, and 0.9% is in some other unavailable form. This leaves only 0.3% of the fresh water on earth available to us on the surface with 87% in lakes, 11% in swamps, and 2% in rivers. This means that only 0.1% of all the water on the earth is available for industrial, agricultural, and human use. And of these three general uses, 70% is for agricultural use, 20% for industrial use, and only 10% for human consumption. Going further with the calculations results in only 0.01% of all the water on the earth being consumed by humans, and as the population grows, that leaves less for everyone.

      According to the United Nations, two-thirds of the world's population

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