Abstract
The earth is sick and the present work explains how it gets ill and how serious the decease is. It is shown that the illness originates in over dense population since present population is 7.6 billion while 1.3 billion is the breakeven point of the earth for CO2 metabolism and 6.7 billion is the upper limit to maintain a quasi-equilibrium state for the metabolism. More and more greenhouse gases emit into atmosphere from underground and undersea, and warming up process is accelerated. Utilization of clean energy cannot save the earth, but to pray a little ice age coming soon. What humanity can and should do is to use zero-emitted coal power and change the fertility rate to negative.
Highlights
The earth is sick and the present work explains how it gets ill and how serious the decease is
The earth is obviously disturbed by human activities too much when the population becomes too dense
Food and fuel are inevitable for human activities, and both of them yield greenhouse gases; clean energy alone cannot save the earth from illness; second, how much population is too dense to be intolerable by the earth?
Summary
The earth gets ill and warms up continuously for recent years as shown in Figure 1 [1] This observation was thought of natural periodic change by few scholars; it is commonly attributed to the higher than normal concentration of CO2 in atmosphere, which causes greenhouse effect. To make the second point clear, a figure of global CO2 emission versus world population was drawn for the period 1850-2008 as shown in Figure 2(a) [2]. The fever of the earth originates in over-population because warming up is caused by the greenhouse effect
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