For the past three decades, monarch butterflies have been dwindling.
The iconic bugs face a number of threats in North America, from weed killers to climate change, but it hasn’t been clear which one has been the most damaging. A new study, however, indicates that the butterflies are especially sensitive to weather conditions in their spring and summer breeding grounds.
Scientists analyzed data from more than 18,000 monarch counts from across the United States, Mexico, and Canada spanning 25 years. They found that over the past 15 years, climate had an influence on the eastern monarch population that was nearly seven times that of other variables such as herbicide use.
A new study estimates that life expectancy in the U.S. decreased by nearly two years between 2018 and 2020, largely due to the COVID-19 pandemic.
And the declines were most pronounced among minority groups, including Black and Hispanic people. In 2018, average life expectancy in the U.S. was about 79 years (78.7). It declined to about 77 years (76.9) by the end of 2020, according to a new study published in the British Medical Journal.
“We have not seen a decrease like this since World War II. It’s a horrific decrease in life expectancy,” said Steven Woolf of the Virginia Commonwealth University School of Medicine and an author of the study released on Wednesday.
(The study is based on data from the National Center for Health Statistics and includes simulated estimates for 2020.)
The two guides featured in today’s post have something in common – transportation.
You might not think of either as a “business” topic but they are, because both are their own industries and because logistics – the commercial activity of transporting goods to customers – are core parts of the U.S. economy and world trade.
Ury knew that ghost forests were expanding in the region, but only when she began looking down from above using Google Earth did she realize how extensive they were.
“I found so many dead forests,” says Ury, an ecologist at Duke University and co-author of a paper on the rapid deforestation of the North Carolina coast published last month in the journal Ecological Applications. “They were everywhere.”