Think about it for a moment. How many different plots can you think of for a novel?
My guess is not many.
Romance
Mystery
Horror
Religious
Historical Novels (Romance usually)
Can you think of more?
Occasionally you do get something original -- something that resembles no other novel (for example). I'm think of something like James Joyce's <em>Ulysses. </em> There are great novel's from the past, but they fit into some category or another. Ulysses does not I don't think. The other genres (like poetry - especially poetry) don't always fit into a category.
Increase in floods, by process of elimination this appears to be best option. With fewer trees the speeds of water and run off increase which increases floods.
n 31 October 1517, he published his '95 Theses', attacking papal abuses and the sale of indulgences. Luther had come to believe that Christians are saved through faith and not through their own efforts. This turned him against many of the major teachings of the Catholic Church.