Corn cultivation spread from Mesoamerica to what is now the American Southwest by about 4000 B.C., but how and when the crop made it to other parts of North America is still a subject of debate.
Cahokia's Rise Parallels Onset of Corn Agriculture
articles
How Particulate Matter Arises From Pollutant Gases
When winter smog takes over Asian mega-cities, more particulate matter is measured in the streets than expected.
Still Sandy After All These Years
In 2002, Earth Observatory published one of the site’s most popular images: the Great Bahama Bank. Eighteen years later, the science has advanced but the sand has not.
The Revolt of the Plants: The Arctic Melts When Plants Stop Breathing
The vapor that plants emit when they breathe serves to lower the land surface temperature, much like watering the yard on a hot day.
NASA Satellite Data Show Air Pollution Decreases over Southwest U.S. Cities
On March 19, California was one of the first states to set mandatory stay-at-home restrictions in an attempt to slow the spread of COVID-19.
Ozone-Depleting Chemical Alternatives Getting Into Our Food and Water
An international environmental agreement to regulate the use of chemicals depleting the ozone layer may have inadvertently allowed higher levels of other harmful chemicals to flourish, new research co-led by York University and Environment and Climate Change Canada has found.
