we know progress slow harnessing potential of energy efficiency and energy savings not only because existing economic interests are looking after their own but also because of the 
Nonetheless, we know that progress is slow in harnessing the potential of energy efficiency and energy savings, not only because existing economic interest groups are looking after their own interests, but also because of the low level of aid for the necessary changes.
we know progress slow harnessing potential of energy efficiency and energy savings, not only because existing economic interest are looking after their own but also because of the level of aid for the changes.