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Human Impact on the Environment - Problems caused by population growth.

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Introduction

Human Impact on the Environment Problems caused by population growth In about 1830 the human population reached one billion, there are now somewhere around six billion people on the planet today and that figure is growing at a very high and very rapid rate. Past populations were controlled by disease, war and famine but now because of technology and modern medicine. The environment around us has been built to support these growing numbers but this development is having a huge effect on the world's ecosystems. Human population's clear other space and habitats of other species to make way for their own. This ignorance has killed many species to extinction and polluted the environment; this has endangered our survival and the survival of other species at risk. However, in natural ecosystems factors are limiting whereas human ecosystems are different as we have the technology to maximise resources and find new ones when existing ones run out. The planet obviously can only hold a certain number of people, most species never reach their maximum numbers but they have a peak, then the numbers start to decline. ...read more.

Middle

These organisms also take the dissolved oxygen in the water so that fish and other aquatic animals die out. Eutrophication is when the nitrate and phosphate levels are high this encourages the growth of algae. These algae can cause a lot of damage to the water ecosystem. * Algae grow rapidly and give an 'algal bloom' over the surface of the water. * Many blue-green algae produce toxins which kill some plants and animals. * Small animals that feed on algae do not multiply fast enough to check the increase in the algae. * Algae block out the light for the rooted plants growing on beds of lakes and they die. This reduces the amount of oxygen. * The algal population crashed due to competition for resources. The algae are then decomposed by bacteria which use the oxygen in the water. * This lack of oxygen kills many invertebrates and fish. All this is the process of eutrophication. The pollution of the atmosphere Pollution is a term used to describe the presence of an unwanted substance. ...read more.

Conclusion

Scientists who work on these models are quick to point out that they are far from perfect representations of reality, and are probably not advanced enough for direct use in policy implementation. Interestingly, as the computer climate models have become more sophisticated in recent years, the predicted increase in temperature has been lowered. However, 98% of total global greenhouse gas emissions are natural (mostly water vapour) and only 2% are from man-made sources. Sustained Development Sustainable development is where a population can make developments and improvements to their area or their needs without causing harm to the environment. Sustainable development is all about a greener planet in both developed and developing countries by not polluting the environment and being more energy friendly. Sustainable development is * Social progress which recognises the needs of everyone * Effective protection of the environment * Prudent use of natural resources Sustained development can be achieved by using less fossil fuels and researching into environmentally friendly sources of energy like solar and geothermic sources. Be less wasteful so that we use fewer resources so that they are prolonged and regenerate, find more effective ways of disposing of waste and producing less waste in the first place. ...read more.

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