maybe few different reasons * sometimes people use it as notebook - just to put their thought on "paper" * "nobody reads" sometimes depends on the subject - some subjects are specific and the audience is limited * it is good to "document" your thought event to yourself - you can reed them in years and see what was your point of view back then. * ....

Yet this is only one of the points mansioned above...

Imagine - what will happen when next big virus/bacteria pandemic hits the earth...Other species will stand a chance when human population makes some room ...it probably sounds bad but unfortunately the humans are the problem - not the CO2 or something else (they are just consequence) - proof is how nature thrives around Chernobyl

Yep. It is a shame that "intelligent" species need a virus or some other disastra and are unable to keep their population within the limits.