Global & Disaster Medicine

Archive for the ‘Climate Change’ Category

Learning about climate change and sustainability will soon be compulsory for all students across Italy


Map of the trend of the Palmer Drought Index from 1900 through 2002.

“…….Starting next school year, schools will be required to dedicate 33 hours per year — almost one hour per school week — to discussing the challenges of climate change,…..”

Climate Changes in the United States


Climate Changes in the United States

“According to a new U.S. Army report, Americans could face a horrifically grim future from climate change involving blackouts, disease, thirst, starvation and war. The study found that the US military itself might also collapse. This could all happen over the next two decades…..”


“…….The report, titled Implications of Climate Change for the U.S. Army, was launched by the U.S. Army War College in partnership with NASA in May at the Wilson Center in Washington DC. The report was commissioned by Gen. Milley during his previous role as the Army’s Chief of Staff……..


The two most prominent scenarios in the report focus on the risk of a collapse of the power grid within “the next 20 years,” and the danger of disease epidemics. Both could be triggered by climate change in the near-term………

The report also warns that the US military should prepare for new foreign interventions in Syria-style conflicts, triggered due to climate-related impacts. Bangladesh in particular is highlighted as the most vulnerable country to climate collapse in the world…..

“The permanent displacement of a large portion of the population of Bangladesh would be a regional catastrophe with the potential to increase global instability,” the report warns. “This is a potential result of climate change complications in just one country. Globally, over 600 million people live at sea level.”

Sea level rise, which could go higher than 2 meters by 2100 according to one recent study, “will displace tens (if not hundreds) of millions of people, creating massive, enduring instability,” the report adds……..

Annual Temperature Anomoly

Annual Temperature vs Average


“…..Climate change will lead to more wildfires nationwide as hotter temperatures dry out plants, making them easier to ignite. ….”


“…….Many residents in Northern California faced a twin threat on Thursday: fires, but also the deliberate power outages meant to mitigate the blazes. Both the Kincade fire and a small fire that ignited Thursday morning, the Spring fire, occurred in or near areas where the state utility, Pacific Gas and Electric, had turned off the power.

The fires “brought out some longer standing institutional issues around equity,” Mr. Gossman said. Critics say electricity cutoffs disproportionately harm low-income people who cannot afford solar and battery backup systems or gas-based generators, as well as sick and disabled people who rely on electricity to run life-saving medical equipment……”

MA coastline change with climate change over the past couple of decades

June 12, 1984  June, 1984


June 12, 1984 July, 2019





J-IDEA, the Abdul Latif Jameel Institute for Disease and Emergency Analytics will rapidly respond to emergencies such as epidemics, extreme climate events, and natural and humanitarian disasters.

Imperial College

“…..J-IDEA will tackle crises, such as Ebola and MERS, alongside longer-term global priorities, including the impact of climate change on health, using cutting-edge data science and public health research to deliver policy insights.

The new institute brings together the world’s foremost epidemiologists, biostatisticians, medics and data scientists as they break down barriers between academic expertise and on-the-ground impact. ….”


“……J-IDEA brings together over 200 researchers working on global health within Imperial College’s School of Public Health. Partnering with governments and international institutions, J-IDEA advances methods and real-world application of data analytics to identify and support effective actions and high priority investments into population health globally – both in responding to crises but also in identifying the cross-cutting investments which will build strong and resilient health systems better able to meet future health challenges and threats…..”

Climate change: Regional impact from changes in the ocean and cryosphere

Special Report on the Ocean and Cryosphere in a Changing Climate


NYT:  “……Earth’s oceans are under severe strain from climate change, a major new United Nations report warns, threatening everything from the ability to harvest seafood to the well-being of hundreds of millions of people living along the coasts.

Rising temperatures are contributing to a drop in fish populations in many regions, and oxygen levels in the ocean are declining while acidity levels are on the rise, posing risks to important marine ecosystems, according to the report issued Wednesday by the Intergovernmental Panel on Climate Change, a group of scientists convened by the United Nations to guide world leaders in policymaking.

In addition, warmer ocean waters, when combined with rising sea levels, threaten to fuel ever more powerful tropical cyclones and floods, the report said, further imperiling coastal regions and worsening a phenomenon that is already contributing to storms like Hurricane Harvey, which devastated Houston two years ago……”


California has experienced a fivefold increase in annual burned area since 1972. Climate change?


Rising Global Temperatures Influence California’s Fire Season

If it seems like California has been getting hit by more and larger fires lately, that’s because it has. In 2017, California endured the Thomas Fire, the state’s largest fire (by area) at that time. One year later, the Mendocino Fire Complex took its place. In 2018, California also suffered its most destructive fire ever and set a new record for burned area in one year.

A study published in July 2019 shows these remarkable fire years are no longer freakish anomalies. They fit with a trend of more frequent and bigger fires. According to the researchers, the annual burned area across California has increased fivefold over the past five decades, and the main driver is higher temperatures.

“Warming is affecting forest fire,” said Park Williams, lead author and a researcher from Columbia University. “But in California, the story is bound to be really complicated because there are a lot of different climate types, vegetation types, and different ways humans are interacting with the landscape.”

Williams and colleagues separated California into four different regions and examined fire activity during different seasons. The graphs above show the seasonal and annual burned area in California for 1972-2018. Overall, the annual burned area increased by 405 percent during that period.

The burned area data came from CalFire Fire Resource and Assessment Program and the Monitoring Trends in Burn Severity dataset, which includes Landsat observations. Using climate models, the team then correlated the burned area with data on monthly precipitation, temperatures, humidity, wind speed, and solar radiation. (Much of this data was derived from NOAA and NASA observations).

The scientists found that the greatest increases in burned area occurred during the summertime (May-September), and particularly in the forests of the North Coast and Sierra Nevada regions. Overall, burned area from summertime forest fires increased by eightfold over the past five decades. “Essentially all of the increase we’ve seen in annual wildfire area in California over the last 50 years is driven by warming in the atmosphere during summertime,” said Williams.

Specifically, the team found the strongest relationship between summer forest fires and the aridity of the atmosphere—a combination of heat and the absence of water vapor. That is not to say other non-climate factors are not important, said Williams. In fact, human activities have probably strengthened the effect of warming in some areas. “By fighting fires and living in forests, humans have increased the vegetation available to burn and the sparks needed to start fires,” said Williams, “so now more than ever the table is set for big fire as soon as hot and dry conditions arrive.”

The plots above show the maximum temperatures from March to October and October to November, averaged across the four California study regions. From 1896 to 2018, the maximum temperature for March to October increased by 1.81°C, which corresponded to a 13 percent increase in vapor pressure deficit (the amount of water missing from the atmosphere). These observed trends match expected trends from climate models responding to anthropogenic (human-caused) emissions. Over the same period, the maximum temperature for October to November increased by 1.67°C, which corresponded to an increase of vapor pressure deficit of 14 percent. Both plots show the future expected temperature trends for the region based on the climate model, Coupled Model Intercomparison Project (CMIP5).

Fall wildfires also evolved. Although fewer fires occur in that season, they tend to be more dramatic now. (The Camp Fire is a prime example.) Unlike summertime forest fires, the severity of fall fire season is influenced by the timing (regular or late arrival) of winter rains and by strong Santa Ana wind events (to fan and spread flames), neither of which showed a significant increase. But if the winds are strong and rains are late, then the extra warming helps create destructive fires.

“Even though rain and the winds haven’t changed by our calculations, the fall fire risk has actually increased,” said Williams. “When you get into fall, that’s when vegetation is driest because it has not rained since spring. It is also warmer by about 1.5°C than it was century ago. That means fuels are drier today than they were a century ago.”

Outside of the forested areas of California, wildfire area has not significantly increased since 1972. Williams noted that grasslands and coastal chaparral are usually already hot, so they are not as sensitive to the extra heat from global warming. Instead, the likelihood for a large fire in such areas depends on the amount of fuel available. For instance, is there enough grass from spring and early summer growth to carry a fire across long distances? As a result, grasslands and chaparral fires tend to occur after a wet winter combined with a dry summer.

“Anytime we hear a one-size-fits-all story for what’s driving the big fires in California, we are not getting the whole story because California is so big,” said Williams. “There are different factors depending on the region and time, and there’s not going to be one solution to fix every fire problem.”

NASA Earth Observatory images by Joshua Stevens, using data from Williams, Park A., et al. (2019). Story by Kasha Patel.

NASA: The world is getting warmer

Global Warming Mapped
Global Warming Mapped

Drowning or sinking islands: the story of Kiritimati


“…….Intensifying storms and weather-related events have displaced an average of 24.1 million people every year around the world since 2008, and the World Bank estimates that another 143 million people will be displaced by 2050 in just three regions: sub-Saharan Africa, South Asia and Latin America……..’

Locator Map for Kiribati

Pronounced "Ki-ris-mas," Kiritimati Island has a large infilled lagoon that gives it the largest land area of any atoll in the world. Captain Cook named the atoll Christmas Island when he arrived on Christmas Eve in 1777. Used for nuclear testing in the 1950s and 1960s, the island is now valued for its marine and wildlife resources. It is particularly important as a seabird nesting site, with an estimated 6 million birds using or breeding on the island, including several million Sooty Terns. Rainfall on Kiritimati is linked to El Nino patterns, with long droughts experienced between the wetter El Nino years. This image is a mosaic of four digital photographs taken on 16 January 2002 from the Space Station. Photo courtesy of NASA.



Recent Posts