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The clean energy sector in the United States lost 429,000 jobs last year due to the economic impacts of Covid-19, with the industry hitting its lowest number of workers since 2015, according to a new analysis of federal unemployment filings.

One reason it’s so difficult to produce effective vaccines against some viruses, including influenza and HIV, is that these viruses mutate very rapidly.

The Messina Strait, a submarine bridge separating the island of Sicily from the Italian Peninsula, is the area with the largest marine litter density worldwide –more than a million objects per square kilometre in some parts–, as reported in a new review paper published in the journal Environmental Research Letters.

Shelled pteropods, microscopic free-swimming sea snails, are widely regarded as indicators for ocean acidification because research has shown that their fragile shells are vulnerable to increasing ocean acidity.

In a collaboration with colleagues at the University of Budapest, University of Copenhagen researchers have analysed and compared a number of samples of green aphids from apples around the world and discovered a new apple-loving pest in Denmark.