A group of scientists from more than 20 institutions around the world will gauge the impact on the world’s largest rainforest if a time comes when the planet has 30 percent more carbon dioxide than today, according to a project launched on Wednesday. A large experiment including towers that will pump CO2 into plots of dense forests will be built in a region north of Manaus, in the Brazilian Amazonas state. Sensors and field observation will evaluate the reaction of the trees when subject to a concentration of carbon dioxide 200 parts per million (ppm) higher than the current 400 ppm, already the highest level ever.
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