Learning Objectives Know why the population is rapidly growing Know the effect of population growth on land and resources

Population Explosion No Natural Predators Better Living Conditions Less Infectious Disease Growing lots of Food

Pollution

More People = More Resources Used More People = More Air Pollution More People = More Water Pollution More People = Less Land Available

Task 3 Answer questions on the information sheets scattered around the room. Information sheets included as a separate PowerPoint and at the end of this presentation.

More People = Less Land Available More people require extra housing and amenities this uses up more land. Mining and quarrying uses up large areas of land in order to access the resources such as gravel, metal ores and diamonds. Large populations of people require large quantities of food. We use billions of acres of land in order to grow enough food and crops for human use. Large populations produce large quantities of waste which is stored in landfill sites. These large quantities of waste contribute to pollution of land, air and water. Questions In what ways do humans use up large areas of land?

More People = More Resources Used Up With increasing population the demand for resources is and raw materials is rapidly rising. As raw materials are only in a limited supply eventually they will run out and cannot be replaced. Fossil Fuels including oil, natural gas & coal Metal Ores Building Materials As people use more resources, more waste is produced. All this waste is polluting the Earth: House hold waste piles up in landfill sites Questions What resources are being rapidly used up? Why will this be more of a problem in later years?

More People = More Water Pollution Waste chemicals are being dumped into rivers and seas. Sewage, fertilizers and toxic chemicals end up in rivers/lakes etc. Toxic chemicals such as pesticides and herbicides may be washed from land to water. Indicator Species can show how polluted the water is. If you find mayfly larva this means the water is very clean, if you can only find water snails or worms then the water is more polluted. If no water life is to be found the water is VERY polluted. Questions If a river has mayfly in it what does this tell you about the level of pollution in the water? Why do farmers need to be careful when fertilising their fields that run alongside rivers? Clean = more invertebrates Polluted water = less invertebrates

More People = More Air Pollution In order to provide enough energy needed for all the people on Earth more fuels need to be burned to create electricity and heat. This will produce more air pollution The most common source of air pollution is the burning of gas, oil and coal. This usually happens in vehicle engines and power stations. Indicator Species can show how polluted the air is. Some species will only survive in very clear air, some can survive in polluted air. If very sensitive species such as lichen are found in an area the air is very clean, if there are no lichens on trees this suggests the air is more polluted. Questions Why has the increasing population caused more air pollution? What is an indicator species?