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A big event in the insect world is approaching. Starting sometime in April or May, depending on latitude, one of the largest broods of 17-year cicadas will emerge from underground in a dozen states, from New York west to Illinois and south into northern Georgia. This group is known as Brood X, as in the Roman numeral for 10.

For about four weeks, wooded and suburban areas will ring with cicadas' whistling and buzzing mating calls. After mating, each female will lay hundreds of eggs in pencil-sized tree branches.

Then the adult cicadas will die. Once the eggs hatch, new cicada nymphs fall from the trees and burrow back underground, starting the cycle again.

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Reforestation is one of the ways we have of trying to mitigate climate change, but choosing where to plant trees is a more complex decision than you might think. This is why researchers have now come up with an interactive map showing the best spots to reforest in the US.

It's called the Reforestation Hub, and it color codes counties to show the reforestation opportunity or potential for success in each area. The team behind the map is hoping it proves a valuable resource for the government and individual conservation agencies.

"Often the information we need to make informed decisions about where to deploy reforestation already exists, it's just scattered across a lot of different locations," says forest restoration scientist Susan Cook-Patton, from the Nature Conservancy organization.

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