Thirty years ago, on April 24, 1990, Hubble was carried aloft from NASA's Kennedy Space Center in Florida aboard the space shuttle Discovery, along with a five-astronaut crew. Deployed into Earth orbit a day later, the telescope opened a new eye onto the cosmos that has been transformative for our civilization.

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To mark Earth Day’s 50th anniversary, amid the coronavirus pandemic, the Gazette contacted experts on climate change, the environment, and sustainability to ask them about their global-warming fears. Here are their answers.

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