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The invention relates to a method for producing construction materials that are stable under pressure and tension in a process that is neutral with regard to CO2-emissions and has a negative CO2 emissions balance in a second step. Rapid growth of algae stimulated with the help of CO2 released when generating energy from fossil or regenerative fuels is used to obtain algae oil for the production of plastic fibers, which are used in particular for the production of carbon fibers, which are processed further so that, when combined with natural stone, they can replace, for example, CO2-intensive construction materials such as concrete, steel, glass and aluminum. The high temperatures required for the production of carbon fibers are also generated in a CO2-neutral manner by bundling sunlight using parabolic mirror technology, for example. Said procedure supplies the fundamental basis for forming an initially CO2-neutral, later CO2-negative balance-based industrial development in order to gain control over global warming of the earth and reverse it step by step over a period of time.