Which event caused so much unrest that it helped bring about the Russian Revolution?
Crimean War
October Manifesto
Russo-Japanese War
World War I

According to new research, more than 5..5 million deaths are associated with polluted air. hope this : ).

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.