Global Warming Effects On Humans
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Global Warming Effects On Humans



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Global Warming Effects On Humans Global Warming Effects On Humans Presentation Transcript

  • Global Warming’s Effect On Humans
  • Extreme Weather
    Rising Sea Levels
    Increase in Disease
    One Immediate Consequence
    Global Rise In Temperature
    “Even the best case scenario suggests substantially more warming over the next century than we have observed over the past 100 years” – Intergovernmental Panel On Climate Change
  • Global Warming:
    Effects of Weather on Humans
  • Wind Patterns
    Walker circulation
    huge loop
    across the Pacific (east to west); air rises in western Pacific; returns eastward at altitude of a few miles; sinks back to surface and starts loop again.
    Peru and Ecuador
    Computer simulations
  • Changes in Precipitation
    El Niño
    rainfall in the southern USA and western South America shows an increase inthe amount of precipitation falling in the next 100 years
  • Heat Waves
    is an extended interval of abnormally hot and usually humid weather
    lasts from a few days to over a week.
    will become more frequent and more intense.
    European heat wave of 2003
    in France nearly 20,000 people died
    South Australian heat wave of 2006
    July 2006, USA
    County of Los Angeles
  • “Since 1980, the earth has experienced 19 of its 20 hottest years on record, with 2005 and 1998 tied for the hottest and 2002 and 2003 coming in second and third.”
    -Natural Resources Defense Council
  • Droughts
    El Niño
    Indonesia, Malaysia and elsewhere in the western Pacific.
    biodiversity loss
    1928-1930, northwest China
    resulted in over 3 million deaths.
    1936, Sichuan Province, China
    worst drought in the modern history
    34 million farmers were relocated and 25 million people starved
  • Wildfires
    Colorado, Arizona, and Oregon
    In 2002, they experienced the second worst wildfire season in the last 50 years.
    More than 7 million acres burned.
  • Tropical Cyclones
    A tropical cyclone is a warm-core, low pressure system that develops over the tropical or subtropical waters
    Also known as hurricanes or typhoons
  • Floods
    Flooding will occur due to rising sea levels from increased precipitation and melting glaciers.
    Eroded sea shores as consequence
  • Localized Rise in Water levels
    In an Ice-Jam, Alaska Waters Rise 15 Feet in 24 Hours
  • Rise in Sea Levels
  • A 40cm rise in Sea-level
    People at risk; 22–29 million by the 2020s, 50–80 million by 2050s, and 88–241 million by the 2080s (Nicholls et al., 1999).
    70-90% located in Africa, Mediterranean, Asia, And small Island States
    Est. 30 Billion in land loss, USA, Zeidler (1997)
  • Climate Change and
    Related Health Effects
  • Overview of Effects
  • Direct Effects: Heat Extremes
    Elevated temperatures during summer months are associated with excess morbidity and mortality. Conservative estimates are that , on average, 240 heat related-deaths occur annually in the United States (McGeehin et al. 2001).
    The most common cause of death and most acute illness directly attributable to heat is heat stroke. Other causes of death observed to increase following heat waves include ischemic heart disease, diabetes, stroke, respiratory disease, accidents, violence, suicide, and homicide (McGeehin et al. 2001).
  • Direct Effects: Heat Extremes
  • Indirect Effects: Air
    Experimental studies have found substantial increases in pollen production resulting from exposure to increased CO2 concentration.
    Climate change has received little attention for its potential in altering the burden of non-communicable disease such as asthma (Beggs et al. 2005).
    Climate change may affect exposures to air pollutants by a) affecting weather and thereby local and regional pollution concentrations; b) affecting anthropogenic emissions, including adaptive responses involving increased fuel combustion for power generation; c) affecting natural sources of air pollutant emissions; and d ) changing the distribution and types of aeroallergens (Bernard et al. 2001).
  • Indirect Effects: Water
    Xavier Rodo, a physical scientist of the University of Barcelona, and his colleagues have described a relationship between cholera and the El Nino/ Southern Oscillation patterns in Bangladesh from 1983 to 2001. The team found that ENSO, which causes warmer equatorial Pacific Ocean temperatures, was responsible for more than 70% of cholera mortality and morbidity (Weinhold 2004).
  • Indirect Effects: Mosquito-Borne Disease
    In the United States, the disappearance of malaria, dengue, and other mosquito-borne diseases was largely due to changes in lifestyles and living conditions. Given that living standards do not change drastically, such factors will remain dominant (Gubler et al. 2001).
  • Mosquito-Borne Diseases: Dengue
    Laboratory research found that replication rates in Dengue fever rose directly with increases in temperature. Models have been created to explore the influence of temperature on the virus. The models suggested that relatively small increases in temperature in temperate climates should increase potential for epidemics (Gubler et al. 2001).
  • Mosquito-Borne Diseases: Malaria
    Incidence and prevalence of malaria may be limited by altitude, and consequently also temperature; yet malaria transmission relies on several other factors.
    Changes in rainfall due to El Nino events are linked to variability in incidents of malaria (Gubler et al. 2001).
    Some biologic modeling of potential impact of climate variables, primarily temperature increases, on malaria as done on a global scale project net increases in the geographic area and season for potential malaria transmission. However, a statistical empirical model approach found no significant net change in malaria projected for the year 2080 (Gubler et al. 2001).
  • Indirect Effects: Ozone
    • The results of an integrated 03 health impacts assessment suggested that changes in climate alone, resulting from growth in greenhouse gas emissions could case 4.5% increase in the number of summer 03 related deaths across the New York Metropolitan region by the 2050s (Knowlton et al. 2004)
  • Potential Impacts
    There is usually at best only long-term data on potentially pertinent disease, and many confounding factors, such as changes in pest control practices, travel patterns, and human settlement density and locations (Weinhold 2004).
    Climate change may lead to increases and changes in clinical behavior in fungal infections that penetrate into subcutaneous tissues, such as sporptrichoisis (Bernard et al. 2001).
    Some infectious diseases may change in tandem with climate. Based on increasing evidence, disease suspected of changing with climatic conditions are malaria, dengue fever, cholera, and yellow fever. But extensive long-term research is limited (Weinhold 2004).
    Asthma is etiologically complex. There are several factors that make up its causal web, many of which are modified by climate. There is some evidence that suggests that asthma prevalence may have plateaued in some countries, but it is too early to determine whether leveling off will be sustained. The hypothesis still stands that the rise in asthma prevalence is related to climate change (Beggs et al. 2005).
  • Agricultural Effects On Humans
  • Projected Temperature Increase
    Global temperatures will rise by 1.5oC to 4.5oC under the scenario of a doubling of CO2 from preindustrial levels which is likely to be reached by 2030
  • Consequences
    • An increase of temperature can cause dairy cattle to have trouble keep their body temperatures regulated
    • Decreased milk production
    • Reproduction decreases due to heat stress lowering the fertility rate
    • Heat stress can decrease animal production, reproduction and profitability
  • Production Decrease
    As many as 63 to 369 million people could be at risk of hunger in 2060 if global warming is not controlled.
    Overall global production would decline by 1 to 8 percent, this decline will lead to higher food prices and the increase in the number of people at risk of hunger.
    Risk of hunger in 2060 could decline by 12 million people if alternative methods such as shifting planting times and vast amounts of irrigation are constructive.
    Or the death toll could increase by 119 million depending on the climate scenario by 2060.
  • The Impact of Global Warming on the Economy
    Wealth is distributed according to climate
  • Change in GDP due to climate change
  • Real Estate (and Agriculture)
    Industry and population are likely to follow food production, water resources, and pleasant weather (moderate temperatures and low risks of natural disasters)
    Assuming a rise in temperature and shift in climate
    Warm, low-altitude real estate value would drop.
    Cold, high-altitude real estate value would rise.
    Coastal property could disappear altogether.
    A favoring of cold, high-altitude land might increase the gap between rich and poor.
  • Stern Review
    “Climate change may initially have small positive effects for a few developed countries, but is likely to be very damaging for the much higher temperature increases expected by mid- to late-century under BAU conditions.”
    In higher-latitude regions, 2-3˚C means higher crop yields, lower energy requirements
    In lower-latitude regions, higher temperatures means lower crop yields and water availability
    Example: Southern Europe
    2˚C increase in temp = 20% decline in agriculture yields and water
    Heat waves like 2003 ($15 billion crop losses) will be common by 2050.
  • Natural Disasters World-Wide
    U.S. in 2003: $65 billion
    U.S. in 2004: $145 billion
    Economic damage 1985-1999
    The world’s wealthiest countries
    57.3% of economic losses
    2.5% of GDP
    The world’s poorest countries
    24.4% of economic losses
    13.4% of GDP
    These numbers will of course increase along with an increase in natural disasters
    IPCC’s Fourth Assessment Report:
    More than 66% certainty of increase in droughts, tropical cyclones, and extreme high tides.
  • IPCC 2001
  • Example: Alaska
    Coastal erosion, floods, and melting permafrost causes high costs by requiring
    Build new buildings
    Build new bridges and roads
    Lay new pipelines
    Repair power grids
  • Total Costs
    Stern Review:
    Business-as-usual: 5-20% GDP
    Mitigate: 1% GDP
    UN’s IPCC: trying to reverse global warming will be cheaper than business-as-usual.