1. global diming
1.1. increased aerosol particles(eg haze) in atmosphere
1.1.1. human activity
2. waste
2.1. improper management eg burning
2.1.1. poisonous gases released
3. Tree-killing insects and diseases can lurk in firewood. These insects and diseases can't move far on their own, but when people move firewood they can jump hundreds of miles. New infestations destroy our forests, property values, and cost huge sums of money to control.
4. deforestation
4.1. subsistence farming
4.1.1. Subsistence agriculture is self-sufficiency farming in which the farmers focus on growing enough food to feed themselves and their families.
4.2. commercial agriculture
4.2.1. Commercial agriculture is a large-scale production of crops for sale, intended for widespread distribution to wholesalers or retail.
4.3. logging
4.3.1. cutting, skidding, on-site processing, and loading of trees or logs onto trucks or skeleton cars.
4.4. fuel wood removal
5. loss of biodiversity
5.1. industrialised fishing
5.1.1. The ocean covers 71% of the earth's surface and 80% of the value of exploited marine resources are attributed to the fishing industry. The fishing industry has provoked various international disputes as wild fish capture rose to a peak about the turn of the century, and has since started a gradual decline.
5.2. acidification
5.2.1. ocean acidification
5.2.1.1. Ocean acidification is the ongoing decrease in the pH of the Earth's oceans, caused by the uptake of carbon dioxide (CO 2) from the atmosphere.
5.2.2. soil acidification
5.2.2.1. Soil acidification is the buildup of hydrogen cations, also called protons, reducing the soil pH. This happens when a proton donor gets added to the soil. The donor can be an acid, such as nitric acid and sulfuric acid (these acids are common components of acid rain).
5.2.3. freshwater acidification