Carbon is a fundamental part of the Earth system. It is one of the primary building blocks of all organic matter on Earth and a key element in setting Earth’s temperature. Carbon moves from the ...

Photosynthesis is the set of light-driven biochemical processes by which phototrophic organisms convert electromagnetic energy into chemical energy, primarily storing it in carbohydrates synthesized ...

Rick Pearson has been the Tribune’s chief political reporter since 1998, after joining the paper a decade earlier as a state government correspondent. He’s covered Illinois and national politics for ...