Scientists have warned that the repercussions of global warming will be extensive and frequently catastrophic.
All around the world, global warming's consequences may be seen and felt. Human activity, particularly the combustion of fossil fuels that release carbon dioxide (CO2), methane, and other greenhouse gases into the atmosphere, is what leads to global warming, the progressive heating of the Earth's surface, seas, and atmosphere.
The effects of global warming are already seen and quantifiable.
Josef Werne, a professor of geology and environmental science at the University of Pittsburgh, told Live Science that "we can watch this happening in real time" in several locations. Both the alpine glaciers and the polar ice caps are disappearing. In certain situations, lakes throughout the world, including Lake Superior, are warming more quickly than their surroundings. Animal migratory patterns are shifting, and plants are modifying the
GLOBAL WARMING INCREASES AVERAGE TEMPERATURES AND TEMPERATURE EXTREMES
a graph displaying the ten warmest years on record for global temperatures. (NOAA credit for image)
The rise in global temperatures is one of the most evident and direct effects of global warming. According to the National Oceanic and Atmospheric Administration, the average global temperature has climbed by around 1.4 degrees Fahrenheit (0.8 degrees Celsius) over the last 100 years (NOAA).
According to NOAA and NASA statistics, 2016 was the warmest year on record globally since record keeping began in 1895. (opens in new tab). Earth's surface temperature that year was 1.78 degrees Fahrenheit (0.99 degrees Celsius) higher than the century-average value. Globally, 2015 was the hottest year on record prior to 2016. 2014, indeed, and before 2015. In fact, since 2005, which tied with 2013 as the hottest year on record, all ten of the warmest years on record have
According to NOAA, 2016 was the second-warmest year on record for the contiguous United States and Alaska. It was also the 20th year in a row that the annual average surface temperature surpassed the 122-year average since records have been kept. In the United States, broken heat records are gradually becoming the norm: June 2021, for example, recorded the highest temperatures on record for that month across 15.2%of the contiguous U.S. According to the National Centers for Environmental Information, that is the country's greatest area of record high temperatures ever.
GLOBAL WARMING INCREASES EXTREME WEATHER EVENTS
On September 26, 2022, Hurricane Ian, a Category 4 hurricane, makes landfall in Florida as seen from the International Space Station. (Nasa Earth Observatory credit for image)
Changes in weather patterns are being caused by rising world average temperatures. Extreme weather is a direct result of global warming.
There are many distinct varieties of these extremes. Contrarily, certain regions may experience colder winters as a result of climate change.
The polar jet stream, which forms the border between warm equatorial air and freezing North Pole air, can move south due to climatic changes, taking cold, Arctic air with it. This is why, despite the long-term trend of global warming, certain states may experience an unexpected cold snap or a colder-than-average winter, according to Werne.
Josef Werne
Werne, a professor of geology and environmental science at the University of Pittsburgh, earned his doctorate in geological sciences with a focus on biogeochemistry from Northwestern University in 2000. Prior to joining the department in 2012, he served as an assistant/associate professor at the University of Minnesota Duluth's Large Lakes Observatory and Department of Chemistry and Biochemistry.
He was a postdoctoral research scientist at the Royal Netherlands Institute for Sea Research from 2000 to 2002. Werne spent a year in Perth, Australia, working as a visiting senior fellow at the University of Western Australia's Institute for Advanced Studies and a visiting researcher at Curtin University's Western Australia Organic and Isotope Geochemistry Centre.
"By definition, climate is the average of the weather over a lengthy period of time. The general climate is not much affected by a single cold (or warm) year or season. We begin to perceive it as a change in climate rather than just an aberrant year of weather when those cold (or warm) years start to occur more frequently "said he.
Other severe weather is changing as a result of global warming. Hurricanes are predicted to grow, on average, more severe in a warming world, according to the Geophysical Fluid Dynamics Laboratory of NOAA(opens in new tab). The majority of computer models predict that the frequency of hurricanes will remain stable or even decline, but those storms that do develop will have the potential to produce more rain due to the
Storm Surge: Hurricane Sandy, Our Changing Climate, and Severe Weather of the Past and Future (opens in new tab) by atmospheric scientist Adam Sobel warns that storms "may still become more regular in some specific places, even if they become less frequent overall" (HarperWave, 2014).
The intensity of hurricanes will also likely increase owing to climate change, according to experts. This is due to the fact that hurricanes are powered by the temperature differential between the chilly upper atmosphere and the warm tropical water. Such temperature disparity widens due to global warming.
The most catastrophic hurricanes, like typhoon Haiyan in the Philippines in 2013, do the greatest damage overall, according to Sobel, a professor at Columbia University in the departments of meteorology and oceanography.
Furthermore, due to the sea level rise brought on by climate change, future hurricanes will be striking shorelines that are already vulnerable to flooding. This indicates that any particular storm will probably result in greater damage than it would have in an environment free of global warming.
On February 20, 2022, lightning bolts illuminate the sky over Montevideo, Uruguay. (Image via Getty Images, Mariana Suarez/AFP) )
Another aspect of the weather that is being impacted by global warming is lightning. A 2014 study(opens in new tab) predicted that if global temperatures keep rising, there would be 50% more lightning strikes in the United States by 2100. Every 1.8 degrees F (1 degree C) of atmospheric warming was shown to result in a 12% increase in lightning activity, according to the study's experts.
To keep track of extreme weather occurrences, NOAA created the U.S. Climate Extremes Index(opens in new tab) (CEI). The CEI reports that during the past 40 years, there have been an increasing frequency of extreme weather occurrences that rank among the most exceptional in recorded history. Extreme weather occurrences, such as heat waves and droughts, are predicted by scientists toundergo substantial adjustments.
Significant modifications to wind patterns, yearly precipitation, and seasonal temperature differences are predicted to be among these changes. By geography and location, these effects change. For instance, the U.S. Environmental Protection Agency (EPA)(opens in new tab) reports that the Southwest has gotten increasingly drier while the eastern United States has been becoming wetter over time.
According to the EPA, these effects are anticipated to endure for several decades or longer since high concentrations of greenhouse gases are likely to linger in the atmosphere for many years.
GLOBAL WARMING MELTS ICE
Melt is one of the main effects of climate change thus far. A 2016 study that was published in the journal Current Climate Change Reports shows that between 1960 and 2015, snow cover decreased over North America, Europe, and Asia.
Permafrost, or permanently frozen ground, has decreased by 10% across the Northern Hemisphere since the early 1900s, according to the National Snow and Ice Data Center. Landslides and other unexpected terrain collapses may result from the melting of permafrost. It can also trigger the thawing of long-buried microorganisms, as happened in a 2016 incident involving a stockpile of reindeer carcasses, which led to an anthrax epidemic.
The shrinkage of Arctic sea ice is one of the most striking consequences of global warming. In both the autumn and winter of 2015 and 2016, sea ice extents reached record-low levels, which indicates that the ice lagged at the period when it should have been at its maximum. Less thick sea ice that lasts for several years results from the thaw.
According to NASA's Operation IceBridge, this means that less heat is reflected back into the atmosphere by the sparkling surface of the ice and more is absorbed by the relatively darker water, generating a feedback loop that results in even greater melt.
A clear consequence of global warming is also the retreat of the glaciers. The U.S. Geological Survey estimates that just 25 glaciers larger than 25 acres remain in Montana's Glacier National Park, where 150 glaciers formerly existed. All throughout the world, glacial regions exhibit a comparable pattern.
A 2016 research published in the journal Nature Geoscience determined that there is a 99% chance that this quick retreat is driven by human-induced climate change. These researchers discovered that certain glaciers receded up to 15 times more than they would have without global warming.
SEA LEVELS AND OCEAN ACIDIFICATION
View of significant bleaching on the Society Islands' coral reefs on May 9, 2019 near Moorea, French Polynesia. (Photo credit: Alexis Rosenfeld/Getty Images)
Sea levels often rise when ice melts. The rate of sea level rise doubled from 0.08 inches (2.1 millimetres) per year between 1993 and 2002 to 0.17 inches (4.4 mm) per year between 2013 and 2021, according to a 2021 study by the World Meteorological Organization.
Sea levels are predicted to rise dramatically as a result of melting polar ice in the Arctic and Antarctic, as well as ice sheets and glaciers in Greenland, North and South America, Europe, and Asia. The EPA estimates that the height of the oceans has increased by roughly 8 inches since 1870, and that the pace of rise will quicken in the years to come. Several coastal regions, where around half of Earth's population resides, will experience significant changes if current trends continue.
According to research, sea levels will be on average 2.3 feet (0.75 metres) higher in New York City, 2.9 feet (0.88 metres) higher in Hampton Roads, Virginia, and 3.5 feet (1.06 metres) higher in Galveston, Texas, by the year 2100, according to the EPA. Global sea levels might increase by as much as 3 feet (0.9 metres) by 2100, according to a report from the IPCC(opens in new tab). This estimate for future sea-level rise represents an increase from the expected 0.9 to 2.7 feet (0.3 to 0.8 metres) that was stated in the IPCC assessment from 2007.
Due to global warming, the oceans are changing in many ways than just sea level. When levels of CO2 grow, the seas absorb some of that gas, which increases
The EPA estimates that the acidity of the seas has grown by around 25% since the Industrial Revolution got underway in the early 1700s. This is an issue in the seas, in large part because many marine creatures (such as corals and oysters) produce calcium carbonate shells, which disintegrate in acidic solutions. "As a result, the ocean becomes increasingly acidic as humans continue to add CO2, destroying an increasing number of sea species' shells. It goes without saying that their health would suffer as a result."
Coral reefs are anticipated to become increasingly rare in locations where they are currently prevalent, including most U.S. seas, if present ocean acidification trends continue. parts were in 2016 and 2017
PLANTS AND ANIMALS
It is anticipated that global warming would have a large and extensive impact on Earth's ecosystems. According to a National Academy of Sciences assessment, many plant and animal species are already relocating their ranges northward or to higher altitudes as a result of warmer temperatures.
"Not only are they heading north, but also away from the equator and towards the poles. They are only moving with the comfortable temperature range, which is moving towards the poles as the average world temperature rises "explained Werne. In the end, he asserted, this becomes a problem when the rate of climate change velocity—a measure of how quickly a location changes in space—exceeds the rate at which many creatures can move. As a result, several creatures
Furthermore, the EPA reports that migrating insects and birds are increasingly arriving in their summer eating and breeding areas days or weeks earlier than they did in the 20th century.
Higher temperatures will also cause numerous disease-causing organisms that were previously exclusive to tropical and subtropical regions to spread throughout the world, eradicating plant and animal species that were previously immune to illness.
Polar creatures are also threatened with extinction, which is a serious issue. The World Wildlife Fund (WWF)(opens in new tab) stated that the Arctic's shrinking sea ice and altering ice melt pose a particular threat to ice-dependent species including walruses (Odobenus rosmarus), polar bears (Ursus maritimus), and narwhals (Monodon monoceros). As a result of the threat posed by climate change, the U.S. Fish and Wildlife Service listed emperor penguins (Aptenodytes forsteri) as an endangered species in October 2022.
One in three plant and animal species may go extinct by the year 2070 as a result of climate change, according to a 2020 research that was published in the journal Proceedings of the National Academy of Sciences.
SOCIAL EFFECTS
The predicted changes to human society may be far more destructive than the expected impacts of climate change on the natural world.
It is conceivable that agricultural systems will suffer a fatal blow. The effects of drought, extreme weather, lack of accumulated snowmelt, increased quantity and variety of pests, lower groundwater tables, and a loss of arable land, though some growing seasons would lengthen, might result in significant crop failures and animal shortages globally.
The effects of carbon dioxide on plant development have also been noted by North Carolina State University(opens in new tab). Although CO2 can accelerate plant development, the plants may lose some of their nutritional value.
According to a number of analyses from organisations as diverse as the U.S. Department of Defense, the Center for American Progress, and the Woodrow Wilson International Center for Scholars, this loss of food security may, in turn, wreck havoc on international food markets and could spark famines, food riots, political instability, and civil unrest globally.
In addition to food that is less nutrient-dense, a negative impact on human health is anticipated to be significant. The American Medical Association has seen an increase in chronic ailments like asthma as well as mosquito-borne illnesses like malaria and dengue fever, most likely as a direct effect of global warming. The Zika virus outbreak in 2016 brought attention to the risks posed by climate change.
When pregnant women contract the illness, the foetuses suffer terrible birth abnormalities, and researchers fear that climate change may make higher-latitude regions livable for the insects that spread the illness. The spread of diseases carried by ticks might potentially be facilitated by longer, hotter summers.
FURTHER READING ON THE IMPACTS OF GLOBAL WARMING
Several countries and organisations maintain current online databases of statistics and research on climate change. The Intergovernmental Panel on Climate Change (IPCC), which published its Sixth Assessment Report(opens in new tab) on the science of climate change in 2021, produces the most thorough and in-depth worldwide studies.
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