11.   In other words, a random jumble can not spontaneously assemble itself into some orderly structure without tapping some outside energy source.

12.   Many congressmen are keen to promote research into renewable energy sources.

13.   Many congressmen are keen to revive research into renewable energy sources like solar and wind power.

14.   Modular, diverse and dispersed small-scale generating facilities using local renewable energy sources would support the local network.

15.   The energy crisis has suddenly made governments show extraordinary interest in investing large sums in research into alternative energy sources.

16.   The government needs to invest more in renewable energy sources.

17.   The incentive scheme was introduced to encourage companies to use renewable energy sources.