Climate change Quote by William Happer

“at 378 parts per million, current CO2 levels are unprecedented in recent geological history. (The previous high, of 299 parts per million, was reached…

— Elizabeth Kolbert

The concentration of atmospheric carbon dioxide has changed greatly since fossilized life began on Earth nearly 600 million years ago. In fact, there is…

— Greg Benson

“The record from the Vostok core shows that CO2 levels and temperatures have varied in tandem. Current CO2 levels are unprecedented in the last…

— Elizabeth Kolbert

When I was a boy in the 1930s, the carbon dioxide level was still below 300 parts per million. This year, it reached 382,…

— David Attenborough

“CO2 had increased due to human activities, CO2 will continue to increase unless changes are made, and these increases will affect weather, agriculture, and…

— Naomi Oreskes

“When the Earth was only about a third of its eventual size, it was probably already beginning to form an atmosphere, mostly of carbon…

— Bill Bryson

“It’s] pretty clear that times of high carbon dioxide—and especially times when carbon dioxide levels rapidly rose—coincided with the mass extinctions,” writes University of…

— Peter Brannen

The scientists who do climate research understand that much of the ever increasing concentration of CO2 in the atmosphere since 1850 must be attributed…

— John Olver

“Since about 1850, twice as much atmospheric carbon dioxide has derived from farming practices as from the burning of fossil fuels (the roles crossed…

— Judith D. Schwartz

Our CO2 mixes with everyone else's within a year, then hangs around for centuries like a shroud.

— William H. Calvin

“Research on air quality in New York City, Phoenix, and Baltimore shows that ambient CO2 parts per million (ppm) levels can spike into the…

— Linda Marsa

Paleoclimatic records show clearly that the past 10,000 years, the Holocene, is a remarkably stable period in which we went from being a few…

— Johan Rockstrom