ADVERTISEMENT
  About the SA Blog Network

Posts Tagged "keeling"

Observations

400 PPM: Carbon Dioxide in the Atmosphere Reaches Prehistoric Levels

400 PPM: What’s Next for a Warming Planet Concentrations of greenhouse gases in the atmosphere have reached this level for the first time in millions of years. What does this portend? » On May 2, after nightfall shut down photosynthesis for the day in Hawaii, carbon dioxide levels in the atmosphere touched 400 parts-per-million there [...]

Keep reading »

More from Scientific American

Scientific American Back To School

Back to School Sale!

12 Digital Issues + 4 Years of Archive Access just $19.99

Order Now >

X

Email this Article

X