Why are they disappearing?
Because of the worsening environment,the rising sea level and all other dangerous reasons.
Does anyone know how many places are disappearing from the world?
I am afraid not.Because there are just too many.
If human beings don't take any actions immediately,with the average temperature rising another 2 degrees,the cities of Venice,Paris,Bangkok and Tokyo,and the natural beauties of Cape of Good Hope,Aegean Sea,Tianshan Glaciers,and the Amazon Forrests will all disappear.The natural beauties,the ancient civilized cultures,and the animals and plantations will all be wiped out from us,from the world.