'Climatic variations' and 'Human activities' can be regarded as the two main causes of desertification. removal of the natural vegetation cover（by taking too much fuel wood）, agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity.
Technology allows us to extend our own ideas into the physical world using tools and generally, the goal of this is to improve the quality of life for ourselves or others. <span>One of the downsides to adapting technology to improve our lives is that in the process, we very often hurt something else such as the ecosystem and in turn, this hurts our quality of life.</span>
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deondra12 said: It is the right distance from the sun, it is protected from harmful solar radiation by its magnetic field, it is kept warm by an insulating atomsphere, and it has the right chemical ingredients for life, including water and carbon.
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dramatic changes occurred in the way people lived
