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This is Scientific American 60-second science. I'm Cynthia Graber. Got a minute?

Some 12% of the forests of the Amazon have been lost in recorded history. Another 9 to 28%

will be gone by 2050. But we've not known which species of trees are taking the biggest hits,

in part because it's so difficult to do the fieldwork involved in species surveys.

Now, in a massive effort, a team of more than 158 researchers studied 1,200 plots of trees in the Amazon. They estimated the effects of deforestation on 5,000 species and modeled the impact

of deforestation on some 10,000 more. With the business-as-us-us-us-us-sur-

scenario, roughly half of the Amazon would be disforested in 2050,

leading to similar losses in mean species abundances.

Hans Tristicea of Utrecht University in the Netherlands, one of the study participants.

The findings mean that 36 to 57 percent of Amazon trees could qualify for the International Union

for the Conservation of Nature's red list of Threatened Species, including the commercially valuable Brazil nut and cacao.

Nigel Pittman of Chicago's Field Museum also worked on the study.

So if we were to put on the red list, all of these Amazonian trees that aren't currently

listed, but probably deserved to be, that increased the

total number of threatened species on Earth by about a quarter, by 22%.

The research is in the journal Science Advances.

But there is some good news. Government actions could slow the rate of deforestation.

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