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There are 21 clues with the answer 'BIOGAS'
# CLUE
1.
Renewable fuel derived from organic waste
2.
______ differs from natural gas in that it is a renewable energy source produced biologically through anaerobic digestion rather than a fossil fuel (6)
3.
Methane, carbon dioxide, etc.
4.
Fuel derived from fermenting organic waste
5.
Graduates collect ten grand for green fuel
6.
Influence over westerly turn to green fuel (6)
7.
Naturally produced methane
8.
Renewable fuel made from organic matter
9.
Manure byproduct
10.
Renewable fuel for some farmers
11.
Result of some fermentation
12.
Renewable fuel derived from organic matter
13.
Renewable fuel
14.
Methane
15.
Fuel from decaying organic matter
16.
Fuel produced by the breakdown of organic matter
17.
One found in peat, a source of sustainable energy? (6)
18.
Methane from plant matter
19.
Having fun with short life - it's a source of energy
20.
Byproduct of composting
21.
Some years ago, Iberians turned over fuel from waste (6)