Today's society faces, as no generation before it, two main energy related threats: fi rst, to guarantee secure and affordable energy supply and second, to reduce and abolish environmental and climate harms caused by energy consumption. Over 80 per cent of today's primary energy consumption is coming from non-renewable fossil fuels, as coal, oil and gas. If we do not change our behaviour, our
... [Show full abstract] future share of fossil fuel resources will remain as high as it is today.