‘Two theoretical physicists specializing in complex systems conclude that global deforestation due to human activities is on track to trigger the “irreversible collapse” of human civilization within the next two to four decades. 
If we continue destroying and degrading the world’s forests, Earth will no longer be able to sustain a large human population, according to a peer-reviewed paper published this May in Nature Scientific Reports. They say that if the rate of deforestation continues, “all the forests would disappear approximately in 100–200 years.”…’ (VICE)