2.  Reasons for proper heat insulation  Development of energy saving standards in Germany  Ways to achieve these goals  A look into the future

3.  Earth heats up in a speed never seen before  Natural resources come to an end and therefore need to be conserved  Carbondioxide accumulates in the atmosphere faster than it can be recycled by nature

4. Buildings after 1977 standards Buildings after 1995 standards Low energie houses Passive house VentilationLow requirements Window ventilation Mechanic exhaust air ventilation Ventilation with heat recycling Solar and internal heat savings Low efficiency Little efficiencvy Effective, not yet sufficient Very efficient HeatingHighMiddleLow, little adjustable Not necessary Maximum yearly thermal heat usage 280 to 180 kWh/m²a 100 to 54 kWh/m²a 70 to 50 kWh/m²a < 15 kWh/m²a Oil needed per year 18 to 13 l/m²a 9 l/m²a5 to 4 l/m²a -

5.  Governmental sponsorship of renovating old buildings with new standards  Governmental sponsorship when building passive houses  Energy saving requirements that have to be fulfilled by newly-built houses

6.  Develop better materials for insulation and airtightness  Build in new window types with gas filling for better insulation of windows  Prevention of constructional thermal bridges

7.  More efficient use of regenerative energies: - solar energy - wind energy - geothermal energy - hydro power  Set even higher standards for newly-built houses