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Event partner MSN handed out packets of spruce and pine tree seeds.

The event here featured two reunited groups — the Police and the Smashing Pumpkins — and capped 24 hours of climate-change fanfare.

The shows, dubbed “concerts for the climate in crisis,” were in Sydney, Australia; Tokyo; Shanghai; Hamburg, Germany; London; Johannesburg; and Rio de Janeiro and featured artists such as the Black Eyed Peas, Jack Johnson and Shakira. A group of researchers in Antarctica performed, and their images were beamed to stages at the other shows.