Worst Effects of Global Warming

Conflicts and War

Declining amounts of quality food, water and land may be leading to an increase in global security threats, conflict and war.

National security experts analyzing the current conflict in Sudan's Darfur region suggest that while global warming is not the sole cause of the crisis, its roots may be traced to the impact of climate change, specifically the reduction of available natural resources [source: Seattle Post-Intelligencer]. The violence in Darfur broke out during a time of drought, after two decades of little-to-no rain along with rising temperatures in the nearby Indian Ocean.

Scientists and military analysts alike are theorizing climate change and its consequences such as food and water instability pose threats for war and conflict, suggesting that violence and ecological crises are entangled. Countries suffering from water shortages and crop loss become vulnerable to security trouble, including regional instability, panic and aggression.

Image Credit: Jacob Silberberg/Getty Images

The conflict in Darfur has been partly blamed on stresses caused by global warming.



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Worst Effects of Global Warming: Economic Consequences

The costs associated with climate change rise along with the temperatures. Severe storms and floods combined with agricultural losses cause billions of dollars in damages, and money is needed to treat and control the spread of disease. Extreme weather can create extreme financial setbacks. For example, during the record-breaking hurricane year of 2005, Louisiana saw a 15 percent drop in income during the months following the storms, while property damage was estimated at $135 billion [source: Global Development and Environment Institute, Tufts University].

Economic considerations reach into nearly every facet of our lives. Consumers face rising food and energy costs along with increased insurance premiums for health and home. Governments suffer the consequences of diminished tourism and industrial profits, soaring energy, food and water demands, disaster cleanup and border tensions.

And ignoring the problem won't make it go away. A recent study conducted by the Global Development and Environment Institute at Tufts University suggests that inaction in the face of global warming crises could result in a $20 trillion price tag by 2100 [source: Global Development and Environment Institute, Tufts University].

In addition to the loss of life caused by Hurricane Katrina, New Orleans and Louisiana have faced the economic consequences of billions of dollars in damage.





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Worst Effects of Global Warming: Disease

 A field sample of mosquitoes that could carry West Nile virus pictured in California. Image Credit: David McNew/Getty Images


Depending on where you live, you may use bug repellant to protect against West Nile virus or Lyme disease. But when was the last time you considered your risk of contracting dengue fever?

Warmer temperatures along with associated floods and droughts are encouraging worldwide health threats by creating an environment where mosquitoes, ticks, mice and other disease-carrying creatures thrive. The World Health Organization (WHO) reports that outbreaks of new or resurgent diseases are on the rise and in more disparate countries than ever before, including tropical illnesses in once cold climates -- such as mosquitoes infecting Canadians with West Nile virus.

While more than 150,000 people die from climate change-related sickness each year, everything from heat-related heart and respiratory problems to malaria are on the rise [source: The Washington Post]. Cases of allergies and asthma are also increasing. How is hay fever related to global warming? Global warming fosters increased smog -- which is linked to mounting instances of asthma attacks -- and also advances weed growth, a bane for allergy sufferers.


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Worst Effects of Global Warming: Drought

Worldwide droughts, like that in a village northeast of Nairobi, expose rural communities to food shortages. Image Credit: Simon Maina/AFP/Getty Images


While some parts of the world may find themselves deluged by increasing storms and rising waters, other areas may find themselves suffering from drought. As the climate warms, experts estimate drought conditions may increase by at least 66 percent [source: Scientific American]. An increase in drought conditions leads quickly to a shrinking water supply and a decrease in quality agricultural conditions. This puts global food production and supply in danger and leaves populations at risk for starvation.

Today, India, Pakistan and sub-Saharan Africa already experience droughts, and experts predict precipitation could continue to dwindle in the coming decades. Estimates paint a dire picture. The Intergovernmental Panel on Climate Change suggests that by 2020, 75 to 250 million Africans may experience water shortages, and the continent's agricultural output will decrease by 50 percent [source: BBC].


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Worst Effects of Global Warming

Storms and Floods

Experts use climate models to project the impact rising global temperatures will have on precipitation. However, no modeling is needed to see that severe storms are happening more frequently: In just 30 years the occurrence of the strongest hurricanes -- categories 4 and 5 -- has nearly doubled [source: An Inconvenient Truth].

Warm waters give hurricanes their strength, and scientists are correlating the increase in ocean and atmospheric temperatures to the rate of violent storms. During the last few years, both the United States and Britain have experienced extreme storms and flooding, costing lives and billions of dollars in damages. Between 1905 and 2005 the frequency of hurricanes has been on a steady ascent. From 1905 to 1930, there were an average of 3.5 hurricanes per year; 5.1 between 1931 and 1994; and 8.4 between 1995 and 2005 [source: USA Today]. In 2005, a record number of tropical storms developed, and in 2007, the worst flooding in 60 years hit Britain [sources: Reuters, Center for American Progress].

Warmer waters increase the likelihood of violent storms. Hurricane Dolly swept over the Texas-Mexico border in July 2008.


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Worst Effects of Global Warming

Heat Waves

The deadly heat wave that swept across Europe in 2003, killing an estimated 35,000 people, could be the harbinger of an intense heat trend that scientists began tracking in the early 1900s [source: MSNBC].

Extreme heat waves are happening two to four times more often now, steadily rising over the last 50 to 100 years, and are projected to be 100 times more likely over the next 40 years [source: Global Development and Environment Institute, Tufts University]. Experts suggest continued heat waves may mean future increases in wildfires, heat-related illness and a general rise in the planet's mean temperature.

Heat waves not only make it seem difficult to function, they can be deadly as well. This man tried to cool himself with a water bottle during a 2008 heat wave in New York City.

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Worst Effects of Global Warming

Shrinking Glaciers

You don't need special equipment to see that glaciers around the world are shrinking. Tundra once covered with thick permafrost is melting with rising surface temperatures and is now coated with plant life.

In the span of a century, glaciers in Montana's Glacier National Park have deteriorated from 150 to just 35 [source: New York Times]. And the Himalayan glaciers that feed the Ganges River, which supplies drinking and irrigation water to 500 million people, are reportedly shrinking by 40 yards (37 meters) each year [source: The Washington Post].
Montana's Glacier National Park will lose some of its majestic beauty as surface temperatures continue to rise.



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Worst Effects of Global Warming

Rising Sea Level

Earth's hotter temperature doesn't necessarily mean the Miami lifestyle is moving to the Arctic, but it does mean rising sea levels. How are hotter temperatures linked to rising waters? Hotter temperatures mean ice -- glaciers, sea ice and polar ice sheets -- is melting, increasing the amount of water in the world's seas and oceans.

Scientists are able to measure that melt water from Greenland's ice cap directly impacts people in the United States: The flow of the Colorado River has increased sixfold [source: Scientific American]. And scientists project that as the ice shelves on Greenland and Antarctica melt, sea levels could be more than 20 feet (6 meters) higher in 2100 than they are today [source: An Inconvenient Truth]. Such levels would submerge many of Indonesia's tropical islands and flood low-lying areas such as Miami, New York City's Lower Manhattan and Bangladesh.

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