1. Deforestation
1.1. Soil erosion
1.1.1. when trees are removed , the soil is directly exposed to force of the rain. there is no roots to bind the soil. thus the topsoil is eroded during heavy rain.
1.1.2. leads to flooding
1.2. flooding
1.2.1. due to soil erosion
1.2.2. eroded soil maybe deposited in rivers and streams, blocking the flow of water. the water level in rivers risw rapidly , causing floods
1.3. Desertification
1.3.1. affects the livelihoods of millions of people who rely on the benefits that dryland (land that is lacked of water) ecosystems can provide.
1.4. Climate change
1.4.1. when forests are logged or burnt, that carbon is released into the atmosphere, increasing the amount of carbon dioxide and other greenhouse gases and accelerating the rate of climate change
2. Over-fishing
2.1. reduction in the populations of species which prey on the targeted species
2.2. affect biological diversity
2.3. entire ecosystem can get messed up.
3. Pollution
3.1. Inorganic Waste
3.1.1. Affects Marine life
3.1.2. Affects the people who consume the aquatic organism
3.2. Insectidies
3.2.1. Destroys crops
3.2.2. Transmit disesase
3.2.3. can be carried by rain water into river, streams and lakes , they can accumulate in high concentration in the bodies of aquatic organisms