I don't understand this part. How is putting your body to test in different environments any closer to simply taking drugs ?

Altitude increases your EPO levels. Taking EPO by injecting it does the same thing. Neither is natural or not exactly - also they may both have certain risks from a health perspective as increasing the amount of red blood cells makes your blood thicker.

Also , it's mind blowing what is happening in cycling . This list of doping cases is crazy

Very true. I think it is not just cycling through - I suspect if there was some perfect method of knowing who was using and who was not the results would be shocking.