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There are 31 clues with the answer 'BIOFUEL'
# CLUE
1.
Converting one of blue or green power source (7)
2.
Algae, at times
3.
Green diesel, maybe, turning blue, if old (7)
4.
One old fellow put in blue compound to get green energy (7)
5.
Brief attempt to introduce oil for petrol as a green energy (7)
6.
Green diesel, maybe, turning blue, if old
7.
One old fellow in blue disputed source of energy (7)
8.
Eco energy source
9.
Fuel derived from organic matter (7)
10.
Substitute for gas boiler's top half working with flue (7)
11.
Curious university foible that avoids putting fossils into power
12.
Form of renewable energy produced through biological rather than geological processes (7)
13.
Sporting blue, if inhaling oxygen, gets energy source
14.
Energy source produced by agriculture
15.
Alternative energy source somehow being foul, but not "no good" (7)
16.
Energy source often made from corn
17.
Green energy option
18.
Ethanol, for one
19.
Renewable energy source
20.
It can be made with sugar cane or corn
21.
'Green' gas?
22.
Ethanol, for one (I BEFOUL anagram) (7)
23.
Fuel from organic matter
24.
Alternative power for vehicle (7)
25.
One of blue design going round as a source of energy
26.
Lifebuoy's mostly made with green energy (7)
27.
Back the French university linked to small lie about zero ethanol, e.g. (7)
28.
Renewable source of power from living matter (7)
29.
Fuel produced from organic matter (7)
30.
I befoul another source of energy (7)