Scientist Brad Lister returned to Puerto Rican rainforest after 35 years to find 98% of ground insects had vanished.

In a move to tackle an epidemic of African swine fever, the Polish government has ordered a series of hunts, beginning this weekend, with the aim of killing the vast majority of the country's population of around 200,000 wild boar.

A new analysis, published Thursday in the journal Science, found that the oceans are heating up 40 percent faster on average than a United Nations panel estimated five years ago. The researchers also concluded that ocean temperatures have broken records for several straight years.

California's population of monarch butterflies declined 86% in 2018 compared to the previous year, according to the Xerces Society for Invertebrate Conservation. Overall, the state's monarch population has declined 97% since the 1980s.

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Scientists can now quickly determine a chick's gender before it hatches, potentially ending the need to cull billions of male chicks worldwide.

Recycling or taking the bus rather than driving to work has its place, but scientists are increasingly pointing to a deeper lifestyle change that would be the single biggest way to help the planet: eating far less meat.

Struggles remain on enacting 2015 Paris accord despite more clarity on emissions.