as measured by Hawaii’s Mauna Loa Observatory, since records began 67 years ago. Scientists say that a “safe” concentration of atmospheric carbon dioxide is 350 ppm and that keeping this ...

TEMPO.CO, Jakarta - The Mauna Loa Observatory in Hawaii recorded the largest spike in atmospheric ... U.S. citizens have plenty of places to travel without passport. 10 Highest Cost of Living States ...

The U.S. National Centers for Environmental Information points ... highest daily average of carbon dioxide concentration in the atmosphere was recently recorded at the Mauna Loa Observatory in Hawaii.