The idea that the growing demand for energy worldwide can be met with energy from nuclear power is nonsense.

My office has a view of low-cost housing, old East German prefabricated apartment buildings. It isn't an attractive view, but it's very helpful, because it reminds me to ask myself, whenever there is a decision to be made, whether the people who live there can afford our decisions.

Those who reject integration programs in the long term have as little right to stay in Germany as a hate preacher paid from abroad in a mosque.

However, I have a low opinion of people with narrow political horizons. Someone who talks about the environment and knows nothing about economics can make as many mistakes as someone who does the opposite.

The climate is changing; I don't think you can deny that. But climate has always changed.

I believed Justin Trudeau in 2015. I thought he would be a climate leader. I was wrong.

Climate change is a global crisis - one the international community and private sector must tackle together if we have any hope of averting the worst impacts on our health, our economies, and our communities.

Tackling the extreme gap between the rich and the poor and tackling climate change is part of the same struggle.