I've been reading Jamie Goode's excellent book entitled Wine Science. I'm using it to help me for my impending WSET Diploma exam on viticulture and winemaking.
Don't be put off by the book's title. If you are remotely interested in how wine is made then this book is a great way to understand certain topical subjects in an easily digestable, short chapter format. Covered are subjects such as terroir, global warming, naturalness in wines and corks/screwcaps.
I heard Jamie on the 30/50 podcast recently. It's well worth listening to.