Ancient man Lead a nomadic life in accord with nature. Human settlements began with man encroaching upon nature gradually. Modern civilization has endangered the environment. Essentials like transport vehicles and manufacturing facilities are the main causes of environmental degradation. Air contamination built up during the past century has resulted in global warming. Global warming can change the species composition in the ecosystem. Soil has become infertile and unsuitable for vegetation. Rainwater contamination by acidic discharge from motorized vehicles, factories and industries has resulted in acid rain. Acid rain has also contributed to soil infertility. Global warming has lead to a shortage of water for the vegetation. Most sensitive endemic plants are on the brink of extermination due to insufficient rainfall. Acacia mearnsii is an exotic plant from a tropical region and has suppressed other endemic plant species by releasing alkaloids in soil. Some endemic species under this Tree tolerate this condition and grow under its canopy. This research work shows the population of such endemic plant species in Acacia mearnsii plantation.