11.   These included waste reduction, paper and cardboard recycling and improving energy efficiency.

12.   This guide provides advice on ways of improving energy efficiency.

13.   Scientists can also play a role in improving energy efficiency in their laboratories.

14.   ...investments in energy efficiency that would pay for themselves within five years.

15.   ...energy efficiency.

16.   Houses are graded from nought to ten for energy efficiency.

17.   Another key area where energy efficiency is required is dishwashing.

18.   It is believed to advocate measures such as fuel substitution and energy efficiency.