What are these trees?

poplars
alders
aspens
willows
Willows are very fast growing trees. One of the species, called energy willow, is grown as a source of biomass.
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Very interesting!
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Answers by country

poplars
alders
aspens
willows
answers
flagthe United Kingdom
9%
4%
4%
81%
22
flagPoland
9%
7%
7%
74%
9566
flagGermany
15%
3%
9%
72%
33
flagIndia
15%
15%
11%
57%
26
flagthe United States
10%
10%
15%
57%
19
flagRussia
30%
15%
7%
23%
13