While chalkboards were made of more natural products, as well as used chalk, a more natural alternative to markers, the dust generated by chalk boards were difficult for those that had allergies. Different teachers prefer either whiteboards or chalkboards for different reasons.
It used to be that chalkboards were made of slate from quarries but now they are made of steel with an exterior of porcelain, which makes their production equivalent to whiteboards.
So it comes down to the writing utensils. Dry erase markers are clearly production-intensive: they are made of plastic which means petroleum was used, and they are almost impossible to recycle.
Chalk, meanwhile, is made of calcium carbonate or calcium sulfate, which means that limestone or gypsum needed to be mined (a cause of air pollution) and transported and then it needed to use energy to bake into chalk.
At the end of its life, there isn’t much chalk to throw away. You can also clean boards with water, while dry erase boards require special chemicals. All of this adds up slightly in favor of the chalk boards, but not in a huge way.
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