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For every ton of carbon dioxide emitted by a power plant's smokestack or a car's exhaust pipe, some portion will stay in the Earth's atmosphere, raising global temperatures, while the rest is absorbed by the oceans or ecosystems on land.
But which parts of the ocean or biosphere act as net sources of carbon dioxide (CO2) and which take up more than they emit into the atmosphere, has been an open question. Figuring that out, as well as understanding what mechanisms govern that interplay and how they might change along with the climate, has been an open question and one that is key to understanding how global warming will progress.
The 2014 launch of the Orbiting Carbon Observatory-2 satellite was aimed at beginning to piece together some answers by monitoring the comings and goings of CO2 from the atmosphere with unprecedented precision and over large regions.
The threat for damaging thunderstorms will shift into the southeastern United States as the weekend kicks off.
Three people were injured after severe weather tore from Indiana to Kentucky and Tennessee to end the week.
A new round of severe weather is threatening lives from Ohio through Tennessee and will continue into Saturday morning.
In select regions of the world, people can live long enough to make some wonder if these countries have discovered the heavily sought-after fountain of youth.
A town in Iowa was severely damaged by a tornado on Thursday, while strong storms led to a tour boat disaster in Missouri that killed 17.
A boat carrying 31 people capsized on a lake near Branson, Missouri, as thunderstorms moved through the area on Thursday evening.
The risk of severe thunderstorms, including isolated tornadoes, will progress farther to the east and south over the central United States into Friday night.