We find that US population exposure to
extreme heat increases four - to sixfold over observed levels in the late twentieth century, and that changes in population are as important as changes in climate in driving this outcome.
In recent years, the frequency of heat waves has been increasing in many parts of the world, and the risk associated with
extreme heat increases with further warming.
«We find that US population exposure to
extreme heat increases fourfold to sixfold over observed levels in the late 20th century, and that changes in population are as important as changes in climate in driving this outcome,» they report.
Exposure to
extreme heat increases something called heat shock proteins, or HSPs.
Not exact matches
«Our findings indicate that even a best - case scenario will lead to an
increase in
extreme heat exposure in the future, so from a planning perspective, identifying potential hotspots will help target public health efforts,» says Jones.
«Our results indicate that areas of eastern Texas, Florida, the south - east and mid-Atlantic are areas where rapid population growth, acting in concert with a warming climate, will lead to a significant
increase in exposure to
heat extremes,» says Jones.
The climate, of course, continues to vary around the
increased averages, and
extremes have changed consistently with these averages — frost days and cold days and nights have become less common, while
heat waves and warm days and nights have become more common.
Global warming is causing not only a general
increase in temperatures, but also an
increase in the frequency and intensity of
extreme weather events, such as flooding,
heat waves and droughts.
Rising seas,
increased damage from storm surge and more frequent bouts of
extreme heat will have «specific, measurable impacts on our nation's current assets and ongoing economic activity,» it says.
Increased fluctuations in the path of the North Atlantic jet stream since the 1960s coincide with more
extreme weather events in Europe such as
heat waves, droughts, wildfires and flooding, reports a University of Arizona - led team.
«The
heat waves and drought that are related to such jet stream
extremes happen on top of already
increasing temperatures and global warming — it's a double whammy.»
«Most of the action occurred in changes to
extreme heat, with big
increases in events similar to the Angry Summer of 2012/13.
In many cases, the benefits of
increased CO2 in the atmosphere will be offset by
heat stress, drought and
extreme weather tied to climate change.
The study «shows without a doubt that the projections of climate scientists a few decades ago that the risk of
extreme heat would
increase are now becoming the reality.
Heat extremes have adverse effects on human health and
increase the risk of death across regions in the world,» Zhao said.
«Dangerous» global warming includes consequences such as
increased risk of
extreme weather and climate events ranging from more intense
heat waves, hurricanes, and floods, to prolonged droughts.
The study shows that by century's end, absent serious reductions in global emissions, the most
extreme, once - in -25-years
heat waves would
increase from wet - bulb temperatures of about 31 C to 34.2 C. «It brings us close to the threshold» of survivability, he says, and «anything in the 30s is very severe.»
«Rather striking» climate link to Australian
heat waves Because temperature
extremes are easier to decipher, scientists are fairly confident that global warming
increased the severity and likelihood of
extreme heat events in 2013 in Australia, New Zealand, South Korea, Japan, China and Europe.
Researchers observed a 23 %
increase in risk of asthma hospitalizations when there was an
extreme heat event during summer months.
Our study shows is that
increases in the number of
extreme heat and
extreme precipitation events, particularly during summer months, lead to more asthma hospitalizations in Maryland.»
The changing climate will enhance the wide variations in weather that mid-latitude regions already experience from year to year and bring an
increased number of
extreme events such as
heat waves and hailstorms, Busalacchi says.
Dr Li said the latest research findings give a better understanding of changes in human - perceived equivalent temperature, and indicate global warming has stronger long - term impacts on human beings under both
extreme and non-
extreme weather conditions, suggesting that climate change adaptation can not just focus on
heat wave events, but should be extended to the whole range of effects of temperature
increases.
Researchers emphasize that they are observing an
increased frequency of
extreme heat,
increased heat - wave duration across parts of the country — especially the northern half — and longer fire seasons in the southeast.
Expected
increases in
extreme heat and drought events will bring changes in precipitation, air and water temperatures, air density and humidity, write Matthew Bartos and Mikhail Chester in the current issue of the research journal Nature Climate Change.
At the opposite end of precipitation
extremes, drought also poses risks to public health and safety.192 Drought conditions may
increase the environmental exposure to a broad set of health hazards including wildfires, dust storms,
extreme heat events, flash flooding, degraded water quality, and reduced water quantity.
Vulnerability to winter weather depends on many non-climate factors, including housing, age, and baseline health.185, 186 While deaths and injuries related to
extreme cold events are projected to decline due to climate change, these reductions are not expected to compensate for the
increase in
heat - related deaths.187, 188,189
Some of the risks of
heat - related sickness and death have diminished in recent decades, possibly due to better forecasting,
heat - health early warning systems, and / or
increased access to air conditioning for the U.S. population.182, 183 However,
extreme heat events remain a cause of preventable death nationwide.
In all cases, they found that climate change played a role in
increasing the likelihood of
extreme heat.
While the warming of the normals can look subtle, it also means a substantial
increase in the incidents of
extreme heat and a decrease in the frequency of
extreme cold.
Across the globe in recent decades, there has been an
increase in the number of hot
extremes, particularly very warm nights.1 Hot days have also been hotter and more frequent.2 Since 1950 the number of
heat waves has
increased and
heat waves have become longer.3
In a second study, researchers in Maryland linked
extreme heat to
increases in asthma — a condition that causes trouble breathing.
More
extreme heat will
increase the threat of
heat - related illness such as
heat stroke.
Rising sea levels will make coastal areas more prone to flooding, regional droughts are likely to
increase in frequency and intensity, summer months are likely to have more
extreme -
heat days, and thunderstorms and other weather events are likely to become more intense in some parts of the world.
The signature effects of human - induced climate change — rising seas,
increased damage from storm surge, more frequent bouts of
extreme heat — all have specific, measurable impacts on our nation's current assets and ongoing economic activity.
While ENSO and other sources of natural variability can determine the location of
extremes, 1 the intensity and duration of the associated
extremes such as droughts, and the associated
heat waves, have
increased with climate change.
Maximum monthly temperatures are projected to
increase, as are
extreme heat days (days with temperatures > 90 °F [32 °C]-RRB-, monthly minimum temperatures, frost - free days, and accumulated growing degree - days.
Further, if
extreme heat events
increase substantially, impacts will be negative regardless of water availability.
While
increasing extreme daytime
heat is one of the clearest signs of a warming climate, low temperatures have also been
increasing.
In a 2008 presentation, Dunn stated «I assert that warm is good for human health and that global warming, even the most
extreme estimates, will not create
heat illness or death
increases and certainly no changes that are more important than the basic public health measures of vector control, water, nutrition, sewage and water quality, and housing quality.»
For Southern California, more days of
extreme heat likely mean an
increased number of dangerously polluted days — something the region is already dealing with.
Increasing atmospheric concentrations of carbon dioxide do not only cause global warming, but probably also trigger
increased occurrences of
extreme weather events such as long - lasting droughts,
heat - waves, heavy rainfall events or
extreme storms.
It's the tie that binds and while the global average temperature is the defining metric, the
increasing incidence of
heat waves and longer lasting
extreme heat is how the world will experience it.
If climate change exceeds the temperature target, scientists warn, there is a greater risk that the world's ice sheets will be destabilized, leading to sharply rising seas, and
increasing climate
extremes such as droughts,
heat waves and floods, which could pose daunting challenges for food and water availability for growing populations.
«For the United States, climate change impacts include greater threats of
extreme weather events, sea level rise, and
increased risk of regional water scarcity,
heat waves, wildfires, and the disturbance of biological systems,» the updated 2016 letter says.
Global warming of ∼ 0.6 °C since the 1970s (Fig. 3) has already caused a notable
increase in the occurrence of
extreme summer
heat [46].
The number of
extreme heat waves has
increased several-fold due to global warming [45]--[46], [135] and will
increase further if temperatures continue to rise.
Rising CO2 levels have been linked to the globe's average temperature rise as well as a host of other changes to the climate system including sea level rise, shifts in precipitation, ocean acidification, and an
increase in
extreme heat.
Other studies have shown that climate change
increases the odds of
extreme heat events and may make them warmer and longer lasting.
That said, the total number of people exposed to
extreme heat is expected to
increase the most in cities across the country's southern reaches, including Atlanta, Charlotte, Dallas, Houston, Oklahoma City, Phoenix, Tampa, and San Antonio.
mecchanism = the pathway that links TRPV1 (a pain /
extreme heat sensor) activation to
increase in resting metabolic rate.