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.
When tooth enamel wears down, what becomes visible is the duller dentin beneath the enamel. Italian red wines are less acidic and have less effect on the tint of your teeth than, say, a French red wine or a white wine. Remember that if you swish wine in your mouth, it bathes your teeth in acid.