Answer: Poisonous abiotic factors poses a greater threat to the entire human species.
The abiotic factors are the non-living components of the environment. The life of biotic (living) factors is dependent upon these abiotic factors. The abiotic factors includes water, air, soil. Natural or human induced changes in the abiotic factors can be responsible for human population destruction on a large scale. Water being an abiotic component, the life of different life forms including humans is dependent upon it. Water sources (river, lakes, ponds) if contaminated due to human activities like agriculture and industrial wastes, water transportation wastes which are left in water body. These waste pollutants can be poisonous and produces deleterious effects on human population after consumption hence, may lead to mass elimination of human population. Air may get polluted with poisonous gases like nitrogen, sulphur dioxide, methane, carbon monoxide, carbon dioxide, chlorofluorocarbons. These gases releases as vehicular pollutants, green house gases, natural gas explosion, volcanic eruption can be responsible for mass destruction. Therefore, poisonous abiotic factors poses a great threat to the entire human species.
