How can unemployment be reduced in the euro zone?

"Unemployment is rising markedly in many euro-zone countries (we will look at the cases of France, Spain, Italy and Portugal). To combat unemployment, the causes of unemployment must first be identified. 
- Are we dealing with Keynesian unemployment, linked to sluggish demand and to underutilisation of production capacity? At present, the answer is yes, but the proportion of the unemployment that has a Keynesian origin is small (except in Spain). 
- It is a fact that euro-zone countries are characterised by low productivity gains, in certain cases (France, Italy) by a high tax burden, by significant  destruction of production capacity and by a decline in investment since the crisis. Structural unemployment is therefore high, and a reduction in  Keynesian unemployment would rapidly bring the unemployment rate to  the level of structural unemployment."