The message
from "hendo2002" contains these words:

Just wondering , I have three silver birch trees in the garden all about 30
ft , what is the best way to top these to about 20 odd ft , is it possible
or will I kill them , I have limited knowledge of trees so any help would be
very much appreciated , Thank you

No, you won't kill them.

Cut the trunk at an angle and cover with one of the proprietary
water/disease-proofers available at large nurseries.

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