Vice Chancellor of Germany (1998-2005)

I think energy security means in the future diversifying the supplies and also decreasing the dependency on conventional, mostly fossil fuels, and investing in to the direction of renewable energy and energy efficiency.

I think energy efficiency is a key factor. If you look to nature, nature is extremely efficient in using energy. Because there is no life without a certain form of energy. Nature is extremely efficient and we should learn from nature. I think it is one of the biggest resources we have. And of course there is scale of development between countries which are richer, more developed, less developed and poor countries. I think this is the responsibility of rich countries to invest into the future. And future in the 21st century means not the future of one country. It is completely old-fashioned.