How to protect tigers which become an endangered species?

Tigers are really famous for them ferocity and wickedness,in fact they attack only if they feel threatened.
There are already thirty-seven felines and twenty-five are endangered,we can count the tigers of Bali (1930),Caspian tiger (1970), and the Javan tiger(1972)for the most famous extinct tiger species.(animauxmenacesevblog.fr) What are the reasons for their disappearance and what is the solutions to remedy their spell? Human population growth, degradation of the ecosystem (nuclear test), pollution and the impact caused on the habitat of these species are the main causes of their disappearance.
Indeed, the evolution of the deforestation, which is defined as the removal of a forest or stand of trees Where the and is thereafter converted to a nonforest use (examples of deforestation include conversion of forestland to agriculture or urban use).(wiki), led to regression of areas inhabited by this animals.
Deforestation leads not only disappearance of plants vital for these animals but also causes a climate change.
In Indonesia, reduction of surface is important, falling 70% from 1950 to today, in fact this one is from one hundred and sixty milions hectares to forty-eight milions of hectares. (wwf.fr) this is so for india where only 7% of the territory usually occupied since a century is now inhabited by these species.which shows a very important decline.
The reduction of surfaces appear also in the Caspian and also in the island of Bali and Java, where the number of tigers was important.It is important to emphasize that the average male tiger needed a surface equivalent to sixty m2 and thirty m2 for a female,it could be extend to 1000M2.
This unsustainable practice,the timber industry and oil and lower pay areas cultivated habitats of these animals almost non-existant.
This ecological extinction is unfortunate because it highlights even more the inability of man to take care of nature and