Environmental Issues In Australia Environmental Sciences Essay

Environmental Issues In Australia Environmental Sciences Essay Climate change has come to a stop and is now a major political talking point in Australia in the last two decades. Persistent drought and resulting water restrictions during the first decade of the twenty-first century are an example of natural events attributed by the mainstream media to climate change 1.1 Energy use Australia is a major exporter and consumer of coal, the combustion of which liberates CO2. Consequently, in 2003 Australia was the eighth highest emitter of CO2 gases per capita in the world liberating 16.5 tonnes per capita. Australia is claimed to be one of the countries most at risk from climate change according to the Stern report. Most of Australias demand for electricity depends upon coal-fired thermal generation, owing to the plentiful indigenous coal supply, limited potential for hydro-electric generation and political unwillingness to exploit indigenous uranium resources (although Australia accounted for the worlds second highest production of uranium in 2005) to fuel a carbon neutral domestic nuclear energy program 2 Conservation Conservation in Australia is an issue of state and federal policy. Australia is one of the most biologically diverse countries in the world, with a large portion of species endemic to Australia. Preserving this wealth of biodiversity is important for future generations. A key conservation issue is the preservation of biodiversity, especially by protecting the remaining rainforests. The destruction of habitat by human activities, including land clearing, remains the major cause of biodiversity loss in Australia. The importance of the Australian rainforests to the conservation movement is very high. Australia is the only western country to have large areas of rainforest intact. Forests provide timber, drugs, and food and should be managed to maximize the possible uses. Currently, there are a number of environmental movements and campaigners advocating for action on saving the environment, one such campaign is the Big Switch and I Love Earth. Land management issues including clearance of native vegetation, reafforestation of once-cleared areas, control of exotic weeds and pests, expansion of dryland salinity, and changed fire regimes. Intensification of resource use in sectors such as forestry, fisheries, and agriculture are widely reported to contribute to biodiversity loss in Australia. Coastal and marine environments also have reduced biodiversity from reduced water quality caused by pollution and sediments arising from human settlements and agriculture. In central New South Wales where there are large plains of grassland, problems have risen fromà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬unusual to sayà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬lack of land clearing. The Daintree Rainforest, a tropical rainforest near Daintree, Queensland covering around 1200 square kilometres, is threatened by logging, development, mining and the effects of the high tourist numbers. 3 Invasive species Australias geographical isolation has resulted in the evolution of many delicate ecological relationships that are sensitive to foreign invaders and in many instances provided no natural predators for many of the species subsequently introduced. Introduced plants that have caused widespread problems are lantana and the prickly pear bush. The introduction and spread of animals such as the cane toad or rabbit can disrupt the existing balances between populations and develop into environmental problems. The introduction of cattle into Australia and to a lesser extent the dingo, are other examples of species that have changed the landscape. In some cases the introduction of new species can lead to plagues and the extinction of endemic species. The introduced species red fox has single-handedly caused the extinction of several species. Tasmania takes the threat of red fox introduction so seriously that it has a government sponsored taskforce to prevent fox populations from taking hold on the island 4 Land clearing In the prehistory of Australia the indigenous Australians used fire-stick farming which was an early form of land clearing which caused long term changes to the ecology. With European colonisation land clearing continued on a larger scale for agriculture particularly for cattle, cotton and wheat production. Since European settlement a total of 13% of native vegetation cover has been lost. The extinction of 20 different mammals, 9 bird and 97 plant species have been partially attributed to land clearing. Land clearing is a major source of Australiaà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢s greenhouse gas emissions, and contributed to approximately 12 percent of Australiaà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢s total emissions in 1998. The consequences of land clearing include dryland salinity and soil erosion. These are a major concern to the landcare movement in Australia. The clearing of native vegetation is controlled by Federal laws (indirectly), State law and local planning instruments. The precise details of regulation of vegetation clearing differ according to the location where clearing is proposed. 5 Waterway health The protection of waterways in Australia is a major concern for various reasons including habitat and biodiversity, but also due to use of the waterways by humans. The Murray-Darling Basin is under threat due to irrigation in Australia, causing high levels of salinity which affect agriculture and biodiversity in New South Wales, Victoria and South Australia. These rivers are also affected by pesticide run-off and drought. 6 Water use Water use is a major sustainability issue in Australia. During times of drought Water restrictions in Australia apply to conserve water. Climate change may intensify drought in Australia putting pressure on water resources and leading to alternative water sources including construction of Water tanks, dams, Water transportation and desalination plants many of which affect water catchments and put increasing pressure on the environment. www.tu.org/ www.abc.net.au/news/topic/mining-environmental-issues www.abc.net.au/environment/articles/2009/12/07/2764044.htm www.fwrgroup.com.au/10-environmental-problems.html www.ausstats.abs.gov.au/Ausstats/subscriber.nsf/0//46130_2010.pd