He works at the European division of Discover magazine and is a regular contributor to National Geographic.
Kunzig's writings led him to win a prize in scientific journalism from the American Association for the Advancement of Science, Woods Hole Oceanographic Institution.
He received the American Geophysical Union's "Walter Sullivan Award for Excellence in Science Journalism" in 1994.
This includes a discussion of the work of Klaus Lackner in re-capturing CO2 from the atmosphere—which Kunzig and Broecker consider will play a vital role in reducing emissions and countering global warming.
Most recently, he has also written on the size and impact of the human population on the planet.