The analysis includes data for nearly 30,000 cities and towns of various sizes from across the continental U.S. Each graph provides two possible outcomes: one in which greenhouse gas emissions continue as usual and one in which they are moderately curtailed.
Researchers based their projections on aggregated data from 21 global climate models.
At present, Des Moines experiences an average of zero days per year when the actual temperature is above 100 degrees Fahrenheit. According to this study, the city will likely see 15 days annually that exceed the temperature threshold in 2050 and up to 30 per year in 2100.
As temperatures and humidity rise in the United States, conditions are becoming more favorable for disease-carrying deer ticks.
The U.S. Environmental Protection Agency (EPA) reports that climate change has expanded the geographical range of ticks. Deer ticks specifically are most active when temperatures are above 45 degrees Fahrenheit and humidity is at least 85 percent. As temperatures and humidity rise in many parts of North America, so too are tick populations. The EPA reports that the incidence of Lyme disease in the U.S. has doubled since 1991.
The Northeastern U.S. has experienced the sharpest increase Lyme disease transmission. This part of the country is becoming more humid, making conditions better for ticks to emerge from the ground and latch onto hosts. New Hampshire, Maine, and Vermont have seen the largest spike in Lyme disease incidence since 1991, followed closely by Delaware and Massachusetts. On average, the EPA reports, these states now see 50 to 100 more cases per 100,000 people than they did in 1991.
A recent study by the Pew Charitable Trusts generated flood risk scores for 84,123 primary and secondary schools nationwide.
The report’s authors pointed out that flooding is the most costly and common natural disaster, affecting every region of the U.S. Many times, severe floods badly damage schools, causing them to close. For example, the study points out, floods in West Virginia in June 2016 cost $130 million in damage to regional schools.
Researchers used three metrics to generate county-wide composite flood risk vulnerability scores for schools in all fifty states including: a school’s location within a designated flood zone, the percentage of a school’s neighborhood (as represented by ZIP code) located within a flood zone, and the number of historical flood-related federal disaster declarations in that county.
Among the study’s major findings are that flood risk is distributed across diverse regions of the country. Schools with the highest flood risk scores were located in the Atlantic Coast, Gulf Coast, Mississippi River corridor, and southwestern Arizona. Similarly, those schools with the highest composite flood risk scores were located in both coastal and inland regions. Those 100 counties with the highest composite flood risk scores include 6,444 schools that serve almost 4 million students.
The study made some recommendations for steps policymakers can take to increase flood resiliency for schools. They included generating up-to-date local flood maps, developing pre-disaster flood plans for schools, working to leverage federal assistance, and relocating schools out of floodplains if possible.
The Pew Charitable Trusts full analysis can be found here.
The body of scientific research examining the extent to which extreme weather can be attributed to human-induced climate change is growing. Carbon Brief, a climate journalism site out of the United Kingdom, recently created an interactive map that color-codes these studies, making it easy to discern which events were caused by climate change and which were not.
Carbon Brief mapped a total of 144 extreme weather events worldwide that have been included in “extreme event attribution” studies. The investigators determined that 63 percent of all extreme weather events studied thus far “were made more likely or more severe” by human-induced climate change. Extreme heat waves account for almost half of those events that can be attributed to human-induced global warming.
Roz Pidcock is one of the map’s creators. She said, “The temptation is to look at the result of one study and think that is the definitive last word, but in reality, the evidence needs to be considered in its entirety to make sense of how climate change is influencing extreme weather.”
In 14 percent of the studies, scientists determined that humans had no discernible impact on the likelihood or severity of the weather event. For five percent of the weather events studied, climate change made the event less likely or less intense. The vast majority of these occurrences included cold, snow and ice events.
Perhaps the most striking finding included in the report is the overwhelming effect climate change has on the intensity and severity of heat waves. The investigators looked at 48 heat wave attribution studies and determined that 85 percent of those events were made more severe or more likely thanks to global warming.
The authors write, “One study suggests that the Korean heatwave in the summer of 2013 had become 10 times more likely due to climate change, for example. Only one study on extreme heat didn’t find a role for climate change – an analysis of the Russian heatwave in 2010.”
Fewer than ten extreme weather attribution studies have been published so far in 2017. Carbon Brief plans to continue adding updating its map and providing analysis for new studies as they are published in peer-reviewed articles.
The process, known as geoengineering, can include manually sucking carbon dioxide from the atmosphere or spraying particles up into the air that reflect the sun’s rays and cool the planet. The National Academy of Sciences called for more research on geoengineering back in 2015. Many reputable climate scientists are now searching for funding to conduct small, low-risk experiments to assess potential adverse effects of the intervention.
As Earth’s temperatures reach historic highs, some climate scientists view geoengineering as the best of many bad options, while others say artificially cooling the climate may discourage countries from reducing greenhouse gas emissions.
During the Obama administration, some researchers were hoping to receive government money for geoengineering research. Ted Parsons, an environmental law specialist at UCLA, said that the same researchers are weary of accepting money from Trump’s white house.
Parsons said, “To the extent you’re in a political setting where misinformation about climate change is being spread, efforts to cut emissions are being undermined or threatened, then that suggests the possibility that the risks of pursuing research of this kind might actually outweigh the benefits.”
Scientists gathered at the Forum on U.S. Solar Geoengineering Research last week in Washington D.C. Rose Cairns of the University of Sussex voiced her opposition to the practice. She said, “The very existence of significant research programs, whatever their impact on the physical environment, will fundamentally alter in unpredictable ways the social and political context in which climate governance of the future will be conducted.”
More plainly, Cairns said that she was concerned some countries may use geoengineering technology to set a “global temperature” that mets their needs and not the needs of other countries. She also questioned how the international community could ever decide on one “global temperature,” according to report from NPR.
Many of the researchers present expressed reluctance about the practice. Ted Halstead of the Climate Leadership Council said, “It’s with great reluctance that a lot of us are here.” But climate engineering must be discussed, he said, because “we live in a world where we’re heading towards 4 degrees of warming.”
Following summer months where Sydney’s mean temperature remained 37 degrees Fahrenheit above average, Dr. Perkins-Kirkpatrick at the University of New South Wales in Sydney began to study the relationship between human-induced climate change and summer heat waves.
Along with other researchers at the World Weather Attribution, Perkins-Kirkpatrick concluded that climate change has made it 50 times more likely that New South Wales will experience another similarly scorching summer. Simply put, before 1910 extreme weather like that experienced this summer was likely to occur once every 500 years, now it is likely to occur every 50 years on average. If climate change remains unabated, researchers say that likelihood could increase even more.
The report said, “In the future, a summer as hot as this past summer in New South Wales is likely to happen roughly once every five years.”
Energy companies in New South Wales had trouble supplying enough electricity to meet the demand for air conditioning units during the heatwave’s most intense days from February 9th through the 11th. Meanwhile, according to report by The Guardian, Australian Prime Minister Malcolm Turnbull criticized renewable energy efforts, calling renewable energy goals in the country “completely unrealistic.”
Dr. Andrew King of Melbourne University was another one of the report’s authors. He said, “Yes, people would have experienced 40C [104 degrees Fahrenheit] days several decades ago around different parts of Australia and in Sydney but we know that these incidences of very hot days are getting more frequent and we are setting more records for heat.”
King added, “The purpose of the analysis in this report is to raise awareness that climate change is already impacting on weather in Australia. Hopefully it motivates action on climate change, because we know what the solution to climate change is.”
More than 20 tornados ripped through parts of Iowa, Missouri, Illinois, Indiana and Tennessee on Tuesday.
The severe thunderstorms and tornadoes killed at least three people and left thousands of residents in the Midwest and Southeastern U.S. without electricity. While tornados during winter months are rare, they seem to be happening with increasing frequency.
Typically wintertime tornados form when a forceful jet stream moves across the Southern U.S. and meets colder, retreating air fronts. According to The Weather Channel, usually these tornados crop up in the Deep South, however, in February 2016 severe tornados touched down in Pennsylvania and Virginia, ultimately killing seven people.
On average, February is second-least tornadic month of the year, but recently averages for that month are increasing. February 2008 had 146 total tornados, making it the most tornadic February since the 1950s, and February 2016 came close behind with 138 total twisters.
Due to particularly strong jet-stream level energy characteristic of the winter months, winter tornados can occur at any time of the day or night, unlike more predictable spring and summer tornados that almost always form during the late afternoon and evening. The Weather Channel also points out that it is common for winter twisters to be wrapped in rain, making them more difficult to spot.
Experts remind Midwestern and Southeastern U.S. residents that severe weather in the winter months can be deadly and to create or review their severe weather plans.