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Weather and climate play a significant role in people's health. Changes in climate affect the average weather conditions that we are accustomed to. Warmer average temperatures will likely lead to hotter days and more frequent and longer heat waves. This could increase the number of heat-related illnesses and deaths. Increases in the frequency or severity of extreme weather events such as storms could increase the risk of dangerous flooding, high winds, and other direct threats to people and property. Warmer temperatures could increase the concentrations of unhealthy air and water pollutants. Changes in temperature, precipitation patterns, and extreme events could enhance the spread of some diseases.
The impacts of climate change on health will depend on many factors. These factors include the effectiveness of a community's public health and safety systems to address or prepare for the risk and the behavior, age, gender, and economic status of individuals affected. Impacts will likely vary by region, the sensitivity of populations, the extent and length of exposure to climate change impacts, and society's ability to adapt to change.
Although the United States has well-developed public health systems (compared with those of many developing countries), climate change will still likely affect many Americans. In addition, the impacts of climate change on public health around the globe could have important consequences for the United States. For example, more frequent and intense storms may require more disaster relief and declines in agriculture may increase food shortages.
Heat waves can lead to heat stroke and dehydration, and are the most common cause of weather-related deaths.Excessive heat is more likely to impact populations in northern latitudes where people are less prepared to cope with excessive temperatures. Young children, older adults, people with medical conditions, and the poor are more vulnerable than others to heat-related illness. The share of the U.S. population composed of adults over age 65 is currently 12%, but is projected to grow to 21% by 2050, leading to a larger vulnerable population.
Climate change will likely lead to more frequent, more severe, and longer heat waves in the summer (see 100-degree-days figure), as well as less severe cold spells in the winter. A recent assessment of the science suggests that increases in heat-related deaths due to climate change would outweigh decreases in deaths from cold-snaps.
Urban areas are typically warmer than their rural surroundings. Climate change could lead to even warmer temperatures in cities. This would increase the demand for electricity in the summer to run air conditioning, which in turn would increase air pollution and greenhouse gas emissions from power plants. The impacts of future heat waves could be especially severe in large metropolitan areas. For example, in Los Angeles, annual heat-related deaths are projected to increase two- to seven-fold by the end of the 21st century, depending on the future growth of greenhouse gas emissions.Heat waves are also often accompanied by periods of stagnant air, leading to increases in air pollution and the associated health effects
In 2008, the U.S. Global Change Research Program produced a report that analyzed the impacts of global climate change on human health and welfare. The report finds that:
The frequency and intensity of extreme precipitation events is projected to increase in some locations, as is the severity (wind speeds and rain) of tropical storms. These extreme weather events could cause injuries and, in some cases, death. As with heat waves, the people most at risk include young children, older adults, people with medical conditions, and the poor. Extreme events can also indirectly threaten human health in a number of ways. For example, extreme events can
Despite significant improvements in U.S. air quality since the 1970s, as of 2008 more than 126 million Americans lived in counties that did not meet national air quality standards.
Scientists project that warmer temperatures from climate change will increase the frequency of days with unhealthy levels of ground-level ozone, a harmful air pollutant, and a component in smog.
Particulate matter is the term for a category of extremely small particles and liquid droplets suspended in the atmosphere. Fine particles include particles smaller than 2.5 micrometers (about one ten-thousandth of an inch). These particles may be emitted directly or may be formed in the atmosphere from chemical reactions of gases such as sulfur dioxide, nitrogen dioxide, and volatile organic compounds.
Due to the variety of sources and components of fine particulate matter, scientists do not yet know whether climate change will increase or decrease particulate matter concentrations across the United States.A lot of particulate matter is cleaned from the air by rainfall, so increases in precipitation could have a beneficial effect. At the same time, other climate-related changes in stagnant air episodes, wind patterns, emissions from vegetation and the chemistry of atmospheric pollutants will likely affect particulate matter levels.Climate change will also affect particulates through changes in wildfires, which are expected to become more frequent and intense in a warmer climate.
Climate change may affect allergies and respiratory health. The spring pollen season is already occurring earlier in the United States due to climate change. The length of the season may also have increased. In addition, climate change may facilitate the spread of ragweed, an invasive plant with very allergenic pollen. Tests on ragweed show that increasing carbon dioxide concentrations and temperatures would increase the amount and timing of ragweed pollen production.
Improving America's air quality is one of EPA's top priorities. EPA's Global Change Research Program is investigating the potential consequences of climate change on U.S. air quality. A recent interim assessment finds that:
Changes in climate may enhance the spread of some diseases. Disease-causing agents, called pathogens, can be transmitted through food, water, and animals such as deer, birds, mice, and insects. Climate change could affect all of these transmitters.
The spread of climate-sensitive diseases will depend on both climate and non-climate factors. The United States has public health infrastructure and programs to monitor, manage, and prevent the spread of many diseases. The risks for climate-sensitive diseases can be much higher in poorer countries that have less capacity to prevent and treat illness. For more information, please visit the International Impacts & Adaptation page.
Other linkages exist between climate change and human health. For example, changes in temperature and precipitation, as well as droughts and floods, will likely affect agricultural yields and production. In some regions of the world, these impacts may compromise food security and threaten human health through malnutrition, the spread of infectious diseases, and food poisoning. The worst of these effects are projected to occur in developing countries, among vulnerable populations.Declines in human health in other countries might affect the United States through trade, migration and immigration and have implications for national security.
Although the impacts of climate change have the potential to affect human health in the United States and around the world, there is a lot we can do to prepare for and adapt to these changes. Learn about how we can adapt to climate impacts on health.
Sustainable development has been defined in many ways, but the most frequently quoted definition is from Our Common Future, also known as the Brundtland Report:
"Sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs. It contains within it two key concepts:
the concept of needs, in particular the essential needs of the world's poor, to which overriding priority should be given; and
the idea of limitations imposed by the state of technology and social organization on the environment's ability to meet present and future needs."
All definitions of sustainable development require that we see the world as a system—a system that connects space; and a system that connects time.
When you think of the world as a system over space, you grow to understand that air pollution from North America affects air quality in Asia, and that pesticides sprayed in Argentina could harm fish stocks off the coast of Australia.
And when you think of the world as a system over time, you start to realize that the decisions our grandparents made about how to farm the land continue to affect agricultural practice today; and the economic policies we endorse today will have an impact on urban poverty when our children are adults.
We also understand that quality of life is a system, too. It's good to be physically healthy, but what if you are poor and don't have access to education? It's good to have a secure income, but what if the air in your part of the world is unclean? And it's good to have freedom of religious expression, but what if you can't feed your family?
The concept of sustainable development is rooted in this sort of systems thinking. It helps us understand ourselves and our world. The problems we face are complex and serious—and we can't address them in the same way we created them. But we can address them.
More on Sustainable Development in here.
Of all the planets in our neighborhood, Earth has a surface temperature that is uniquely friendly to life. That friendliness is the result of a balancing act between incoming sunlight and outgoing thermal energy—the heat radiated back to space by everything in the Earth system, from land to oceans to clouds and, especially, by the gases in the atmosphere. Everything from sea ice concentrations, to plant productivity on land and in the oceans, to the strength of tropical cyclones is influenced by Earth’s surface temperature.
The global surface temperature ranked among the top 10 warmest years on record. Over land and ocean combined, 2012 was between 0.14° and 0.17° Celsius (0.25°and 0.31° Fahrenheit) above the 1981–2010 average, depending on the analysis. The globally averaged annual temperature over land was 0.24°–0.29°C (0.43°-0.52°F) above average. And averaged globally, the 2012 ocean temperature was 0.10°–0.14°C (0.18°-0.25°F) above average.
The most prominent warmth during the year was seen across the Northern Hemisphere higher latitudes, specifically the contiguous United States, the eastern half of Canada, southern Europe, western Russia, and the Russian Far East. However, Alaska, the western parts of Canada, eastern Australia, and parts of central Asia all saw cooler than average temperatures during the year.
Nearly all of the ocean surface was warmer than average with the exception of parts of the northeastern and central equatorial Pacific Ocean, parts of the southern Atlantic Ocean, and some regions of the southern oceans. The beginning of 2012 did see some of the lingering cooling effects of La Niña, but they dissipated quickly. Temperatures in 2012 were slightly higher than those of 2011.
This is a partial article, published on the NOAA website, www.climate.gov for the full article see here.
NOAA Climate.gov provides science and information for a climate-smart nation. Americans’ health, security, and economic well-being are closely linked to climate and weather.
The idea of painting roofs white is catching on across the country; Energy Secretary Steven Chu has said it could help in the fight against global warming.
"Cool roofs are one of the quickest and lowest-cost ways we can reduce our global carbon emissions and begin the hard work of slowing climate change," Chu said in July 2010, while announcing that Energy Department buildings would be painted white wherever possible.
Although white roofs keep homes cool in summer by absorbing less heat, they have little impact on winter heating bills, according to the Cool Roof Rating Council, a nonprofit group created in 1998 to research and implement the technology. That's generally because the sun is less intense in winter, the group said, and less important as a heat source. The roofs do not let any more heat escape than other roofs, it said.
In Arizona, cool roofs are mandatory for state and state-funded buildings, while Philadelphia has an ambitious green-energy plan that put cool roofs at its center.
In New York, the Department of Buildings and other public and private groups have vowed to paint 1 million square feet of roof on city-sponsored community buildings. Organizers have advertised on Craigslist for volunteers, promising that the painting is rewarding and fun.
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