In early August, Debra Wunch, an atmospheric physicist at the University of Toronto, got wind that the Trump administration might destroy the NASA satellite that underpins her career.

"It's devastating," said Wunch, who studies how many greenhouse gases Toronto emits and the impact of boreal forests on the carbon cycle. "These satellites have been a fundamental part of my career since 2007 — I've been working with these data for a very long time."

The satellite, OCO-2, is part of NASA's Orbiting Carbon Observatory (OCO) project and measures where on the Earth's surface carbon dioxide is being emitted or absorbed. The data are detailed enough that researchers can pinpoint carbon dioxide emissions from a specific source, such as a power plant or wildfire, and track changes in the growing s

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