I want to know the answer to the following question:
What natural resource were Germany and Austria-Hungary trying to conserve by using DST?
All the background I'm provided with is that "Starting on 30 April 1916, Germany and its World War I ally Austria-Hungary were the first to use DST (German: Sommerzeit) as a way to conserve coal during wartime.". Is that enough to answer the question?
Answer: yes