Based on the Network and the Grey Differential Equation of the Earth's Health Model Analysis and Research

To seek a better approach settling the Earth’s health problem, we construct network model PCA and gray model to study the Earth’s health factors and track the interrelations between human and environment, and then further investigate influence of biological factors and environmental factors on Earth’s health, at last forecast the prediction of the Earth’s health. We propose a mathematical model based on the interrelations of human and environment, establish the cause and effect diagram and summarize a correlation of environmental contamination: extent factors v E w P f a ) , , , , ( 0 0 . In order to predict the trend of the Earth’s health. we propose a modified model and introduce nine new factors which affect the environmental health. And then we predict every factor’s value by using the gray model. Meanwhile, we consider the influence of tipping points, then compare the predictions with the values of tipping points so as to calculate the environmental health index, thus further compute the Earth’s health index, at last we can tract the overall trend of the Earth’s health.