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Hot enough out there? Bet you’re thirsty.

Once you choose what you want to drink, there’s another big decision: What are you going to drink it from?

The container – and I’m not talking about the reusable water bottle you always carry – is a major part of your beverage footprint. (Would that be your “drinkprint?”)

The good news is that companies are responding to greener consumers and are making huge sustainability strides. Just by drinking in 2012 instead of 1982, you’re already to the good.

Glass bottles, for instance, are 40 percent lighter today than they were 20 years ago, which means it takes less fuel and produces fewer emissions to transport them.

Ditto plastic. A few years ago an empty half-liter water bottle weighed 22 grams. Now, it’s 8.5. (Soda bottles are heavier so they can withstand the carbonation.)

As for cans, today’s models have a carbon footprint 43 percent lower than those in 1993.

But you still want to make the best choice. Which is it?

In the absence of an endlessly patient academic willing to spend untold hours on an independent life-cycle analysis, I issued a challenge to the three industries.