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6 Devastating Heat Waves Hitting the Planet

Climate
6 Devastating Heat Waves Hitting the Planet

Need proof that we're having the hottest year on record? Scorching heat is searing parts of the world, sparking wildfires and claiming lives due to heat stroke and dehydration.

A young boy in Calcutta, India keeps himself cool amid a relentless heat wave that has killed thousands of people in his country.
Photo Credit: Saikat Paul / Shutterstock.com

1. India. The relentless heat since mid-April has claimed about 2,330 lives, overwhelming hospitals and devastating the country. As we previously reported, officials have blamed the heat on global warming.

“It’s not just another unusually hot summer—it is climate change," said Dr. Harsh Vardhan, India’s Minister of Science and Technology and Earth Sciences. “Let us not fool ourselves that there is no connection between the unusual number of deaths from the ongoing heatwave and the certainty of another failed monsoon.”

Temperatures have neared 122 degrees Fahrenheit (50 degrees Celsius), causing roads to literally melt in New Delhi.

2. Pakistan. India's neighboring country is also suffering from the horrible heat, with the city of Karachi experiencing temperatures of 113 degrees Fahrenheit (45 degrees Celsius). According to BBC News, the weather has led to the deaths of nearly 700 people, mostly poor and elderly.

Making matters worse, with Pakistanis observing the holy month of Ramadan and fasting during daylight hours, an increased use of electricity for air conditioning has caused outages on their already-unstable grid.

3. The U.S. Southeast. Over on our shores, temperatures in the American South are about 5-15 degrees higher than usual with temperatures ranging between 100 and 115 degrees Fahrenheit, AccuWeather noted. Southerners, especially in southern Georgia and Florida, are also sweltering in the extreme humidity (in the upper 60s and 70s), making it feel even hotter, Weather.com reported.

Those on the West Coast should also brace for extreme heat and wildfires later this month, due to a shift in the jet stream pattern.

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4. Alaska. Not only are glaciers rapidly melting, the northernmost U.S. state experienced record heat at the end of May where parts of Alaska recorded temperatures higher than in Arizona.

Unseasonably high temperatures, unpredictable winds and low humidity have been the perfect storm for wildfires to break out in the state, and as of last Sunday, more than 100 new fires have ignited across the state.

5. Israel. Temperatures recently reached 113 degrees Fahrenheit (45 degrees Celsius) in some parts of the country, causing fires to break out.

In the photo below, animals kept in Israeli zoos are being fed frozen treats to help cool off.

Last month, a 20-year-old tourist from Florida died after taking a fall while hiking the desert fortress of Masada on one of the hottest days of the year. The scary part? According to the Associated Press, she didn't die from injuries from the fall, but from dehydration.

6. Japan. The East Asian country has been shattering their temperature records. According to the Weather Channel, in the city of Otsu in Hokkaido, its April high of 89.4 degrees Fahrenheit (31.9 degrees Celsius) smashed the usual high of 50.9 degrees Fahrenheit (10.5 degrees Celsius). And just this month, roughly 780 people across the country were admitted into hospitals due to a heat wave, Sputnik reported. So far, two people have been reported dead due to the heat.

While the current rainfall must be a welcome reprieve, several prefectures have issued warnings of possible landslides and flooding, according to Sputnik.

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A net-casting ogre-faced spider. CBG Photography Group, Centre for Biodiversity Genomics / CC BY-SA 3.0

Just in time for Halloween, scientists at Cornell University have published some frightening research, especially if you're an insect!

The ghoulishly named ogre-faced spider can "hear" with its legs and use that ability to catch insects flying behind it, the study published in Current Biology Thursday concluded.

"Spiders are sensitive to airborne sound," Cornell professor emeritus Dr. Charles Walcott, who was not involved with the study, told the Cornell Chronicle. "That's the big message really."

The net-casting, ogre-faced spider (Deinopis spinosa) has a unique hunting strategy, as study coauthor Cornell University postdoctoral researcher Jay Stafstrom explained in a video.

They hunt only at night using a special kind of web: an A-shaped frame made from non-sticky silk that supports a fuzzy rectangle that they hold with their front forelegs and use to trap prey.

They do this in two ways. In a maneuver called a "forward strike," they pounce down on prey moving beneath them on the ground. This is enabled by their large eyes — the biggest of any spider. These eyes give them 2,000 times the night vision that we have, Science explained.

But the spiders can also perform a move called the "backward strike," Stafstrom explained, in which they reach their legs behind them and catch insects flying through the air.

"So here comes a flying bug and somehow the spider gets information on the sound direction and its distance. The spiders time the 200-millisecond leap if the fly is within its capture zone – much like an over-the-shoulder catch. The spider gets its prey. They're accurate," coauthor Ronald Hoy, the D & D Joslovitz Merksamer Professor in the Department of Neurobiology and Behavior in the College of Arts and Sciences, told the Cornell Chronicle.

What the researchers wanted to understand was how the spiders could tell what was moving behind them when they have no ears.

It isn't a question of peripheral vision. In a 2016 study, the same team blindfolded the spiders and sent them out to hunt, Science explained. This prevented the spiders from making their forward strikes, but they were still able to catch prey using the backwards strike. The researchers thought the spiders were "hearing" their prey with the sensors on the tips of their legs. All spiders have these sensors, but scientists had previously thought they were only able to detect vibrations through surfaces, not sounds in the air.

To test how well the ogre-faced spiders could actually hear, the researchers conducted a two-part experiment.

First, they inserted electrodes into removed spider legs and into the brains of intact spiders. They put the spiders and the legs into a vibration-proof booth and played sounds from two meters (approximately 6.5 feet) away. The spiders and the legs responded to sounds from 100 hertz to 10,000 hertz.

Next, they played the five sounds that had triggered the biggest response to 25 spiders in the wild and 51 spiders in the lab. More than half the spiders did the "backward strike" move when they heard sounds that have a lower frequency similar to insect wing beats. When the higher frequency sounds were played, the spiders did not move. This suggests the higher frequencies may mimic the sounds of predators like birds.

University of Cincinnati spider behavioral ecologist George Uetz told Science that the results were a "surprise" that indicated science has much to learn about spiders as a whole. Because all spiders have these receptors on their legs, it is possible that all spiders can hear. This theory was first put forward by Walcott 60 years ago, but was dismissed at the time, according to the Cornell Chronicle. But studies of other spiders have turned up further evidence since. A 2016 study found that a kind of jumping spider can pick up sonic vibrations in the air.

"We don't know diddly about spiders," Uetz told Science. "They are much more complex than people ever thought they were."

Learning more provides scientists with an opportunity to study their sensory abilities in order to improve technology like bio-sensors, directional microphones and visual processing algorithms, Stafstrom told CNN.

Hoy agreed.

"The point is any understudied, underappreciated group has fascinating lives, even a yucky spider, and we can learn something from it," he told CNN.

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