Regional effects of global warming vary in nature. Some are the result of a generalised global change, such as rising temperature, resulting in local effects, such as melting ice. In other cases, a change may be related to a change in a particular ocean current or weather system.
In general, white wines exhibit more acidity than red wines. Acidity gives wine its crispness on the palate. A dry wine needs good levels of acid to provide liveliness and balance; sweet wine needs acidity so it does not seem cloying. Too much acidity will make the wine seem harsh or bitter; too little and the wine will seem flabby and dull.
Orange juice is acidic despite its sweet taste. The wide array of juices you can find on grocery store shelves and in the farmers market -- or that you can make at home -- can all be categorized as acidic, alkaline or neutral, depending on their pH level. The lower the pH level is, the more acidic the juice. The acidic range on the pH scale is anything below 7, which is considered neutral. While you might associate acidic juices with a sour taste -- as with lemons and limes -- other acidic juices, such as apple and orange, are often naturally sweet despite their pH levels.