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Global Warming

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Transcript of Global Warming

Greenhouse gases Global Warming The Earth is getting warmer, like an ice-cream melting in the heat... What is happening? Key Greenhouse Gases Carbon Dioxide (CO2) Greenhouse Gases What is a greenhouse gas? Methane (CH4) Human activities that increase carbon dioxide level: Combustion of fossil fuels and any other carbon-based fuels Consequences of Global Warming... These combustion can happen in power stations, factories, car engines and homes. The breaking down of limestone by acid rain or man-made processes, such as making cement, also gives off carbon dioxide. Changes of weather conditions Increase of greenhouse gases will lead to increase in the Earth's average temperatures.
Faster evaporation of water from the Earth's water bodies. Dry Regions Dry climates become drier because of excessive evaporation.
Causes severe droughts and water shortage for plants, animals and people.
Adnormal hot weather will become more frequent. Wet Regions More water vapour in the atmosphere.
More rainfall expected.
Too much rainfall causes floods; areas already suffering from floods will have a worse flooding problem. Impact on plants Different types of vegetation require different climate conditions to grow.
Global warming causes rainfall patterns to change, therefore the vegetation growth would be affected. In countries of the southern hemisphere, a decrease in rainfall would affect the growth of important crops like rice, wheat and corn.
The production of food will decrease, leading to food shortage.
In colder regions like Alaska, the warmer climate causes people to change the type crop they grow. Impact on animals Global warming affects natural habitats.
Animals that cannot adapt to the changing climate and temperature will become extinct. Impact on people Increased temperature in tropical countries lead to the multiplication of mosquito populations, as they live under high temperatures
Lead to the spread of diseases - Malaria, dengue fever and yellow fever. Global warming increases number of hot days in a year.
Long exposure to the Sun and heat waves can cause people to suffer from dehydration and heat stroke. Rising sea levels Rising heat causes the ice caps at the North and South Poles to melt.
Ice caps contain 70% of the world's fresh water supply.
Melting ice caps contributes to the rising of sea levels.
Low-lying coastal islands and major cities will risk flooding and disappearance. What is Global Warming? Global Warming is when average air temperatures around the world are rising. Melting Ice Caps Researchers have published their most advanced calculation for the likely impact of melting ice on global sea levels.
It is estimated that sea levels could rise by 18 to 59cm by the year 2100.
However the report is unsure whether it will be caused by the melting of ice glaciers.
The impact of melting is based on a mid-range level of carbon emissions that would increase global temperatures by 3.5C by the end of this century.
Ice2sea also stressed that sea level rise in line with their estimations could still make some islands in the Pacific uninhabitable. Human activities that increase methane level: Placing decaying organic matter in landfill sites As these buried organic matter rots, methane is produced and can escape into the atmosphere Livestock, such as cattle and sheep, gives out or "belch" methane from their digestive systems McGrath, Matt. BBC News. 'Best estimate' for impact of melting ice on sea level rise. 2013, May 14
http://www.bbc.co.uk/news/science-environment-22527273
As the concentration of the greenhouse gases go higher, the air temperature will grow higher. Dead Fish and Dolphins It is any gas that absorbs heat energy into the atmosphere, and prevents it from escaping to space. Thus, it creates the greenhouse effect. Large numbers of dolphins and fishes have been found on South Australian beaches
Record high sea surface temperatures from summer to April caused thousands of small fish to wash up dead in SA gulf waters
High sea surface temperatures stressed 33 dolphins until they succumbed to a virus normally suppressed by immunity
Increased algal blooms and increased quantities of algae were noticed in the month of March
South-easterly winds trapped waters up above average against the west shoreline of both gulfs, resulting in the deaths of scores of small territorial fish with heat stress
On 20 March, the winds shifted west, causing warm waters to be pushed east, leading to the emergence off Chaetoceros diatom
These algae are equipped with barbs, allowing them to latch onto fish gills and cause inflammation until the fish choke on their own phlegm and die
from 1 March to 7 May, Indo-Pacific bottlenose dolphins had also washed up dead throughout the Gulf of St Vincent and surrounding waters
Affected dolphins were mostly young and likely to have not been immune for a variety of reasons, including heat stress
Sutton, Malcolm. The Guardian. Warmer seas could lead to more dolphin deaths in South Australia. 2013, May 27
http://www.guardian.co.uk/environment/2013/may/28/south-australian-dolphin-deaths Arctic "Greening" The Arctic Circle might experience "greening" in the next few decades
Plants, grass and shrubs might grow on soil in the Arctic, without any snow or permafrost
In the 2050s, 'wooded area' can increase up to 52 percent AFP. (2013 April 1) Arctic 'greening' seen through global warming. Retrieved from:
http://www.asiaone.com/News/Latest%2BNews/World/Story/A1Story20130401-412574.html Done By: Xing Rong, Tiffany, Yu Fan (G9 I) Global Warming News Methane
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