carbon dioxide levels

In the Peruvian Amazon, a researcher studies a fire set by farmers in order to clear land. (Kevin Krajick/Earth Institute)

Where Is All That Carbon Dioxide Going?

Concurrent with the announcement that human carbon emissions reached a new peak this year, Galen McKinley, a researcher at Columbia University’s Lamont-Doherty Earth Observatory, discusses the difficulties of tracking the sources and destinations of carbon dioxide.

by |November 13, 2017
New York City emitted over 54 million tons of CO2 in the year 2010. To imagine this number, every sphere here represents 1 ton of CO2 at the average surface temperature and pressure. Image: Carbon Visuals/Flickr

Why are Past Surface Temperatures and CO2 Concentrations Important?

Kelsey Dyez, a geochemist at the Lamont-Doherty Earth Observatory, describes how the carbon dioxide content of the atmosphere influences climate.

by |November 27, 2015
Cobscook Bay State Park, Maine. Photo: W. Menke

What Geology Has to Say About Global Warming

The most important lessons drawn from geology are that the earth’s climate can change radically, and rapidly. We can’t say precisely at what CO2 level we’re in danger of melting Antarctica, but that threshold could be reached in 150-300 years, if CO2 levels keep rising at the current rate.

by |July 11, 2014