We're at a historical juncture: A growing number of people are declaring what has been achieved over the past decades in Europe to be wrong. They want to return to the nation-state. Sometimes there is even a blood and soil rhetoric that for me is starkly reminiscent of the interwar years of the past century, whose demons we are still all too familiar with.

If cooperation among governments were the superior concept for progress in Europe, I'd be onboard immediately. But the problem is that cooperation isn't working.

The share of wealth held by the minority is much greater than the share held by the majority. We have to draw our own conclusions from that and it has to change.

Donald Trump is withdrawing from the Paris climate agreement because he wants to lower environmental standards for American products and manufacture more cheaply. His reasoning is quite simple, but very shortsighted. It won't succeed because, by doing so, Trump is missing a golden opportunity to modernize American industry.

I firmly believe that the inequity [in society] is enormous. The people have the feeling that you are allowed to do anything if you are rich. But if you're poor, you have to pay. We [Europeans] have to counter this.

We're at a historical juncture: A growing number of people are declaring what has been achieved over the past decades in Europe to be wrong. They want to return to the nation-state. Sometimes there is even a blood and soil rhetoric that for me is starkly reminiscent of the interwar years of the past century, whose demons we are still all too familiar with.

The construction of social housing and the attempt to support families seeking to buy their own homes are all projects from the 1960s and '70s. It all sounds old-fashioned, but it is actually completely modern.