There are at least 7000 languages spoken by humans today but that number is dropping at a rate of about 1 to 2 a week. The top 83 most spoken languages make up 80% of the languages as to numbers of speakers while the bottom 3500 make up .02%.
What is the tragedy here you ask? The loss of all the amassed knowledge of the language and the culture behind it is all. Most of the dying languages have never been written down and will leave no record of them when the last speaker of the language dies.
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