One of the most important achivements on science in 20th century is the new recognition on the Earth:the Earth，out of the other planets, exhibits very peculiar features because it has an extremely complex and active periphery part (surfacial layers).  This periphery part is an open system sustained by inputting solar energe , which is captured , transfered and stored by life. Through the system , cyclings of matters and energe flow are driven and regulated by life activities. This system is self-equilibrated，self-controlled and far away from astrophysical and thermodynamic equilibria mainly because of life and life activities.
    Development of human calture influences increasingly on流Earth's periphery system , at last , the natural biosphere that has existed for 3 billion years on the Earth's surface will inavoidably be replaced by so called "noosphere"，which is man一reconstructed，man-controlled and unstable system. Thus the fate of the Earth，to a great extent，will be determined by the direction of human calture evolution.