Ask A Scientist© Environmental Science Archive

Author:     markbradshaw
Text:       I have heard that in the last couple hundred years, before the 
Industrial Revolution, that the carbon dioxide concentration in the atmosphere 
was higher than it is today. Why has not global warming and the runaway 
greenhouse effect occurred?

Response #: 1 of 1
Author:     Eric Dallman
Text:       I do not know where you read this information. With regard to C02 
levels of recent years, they seem to increase steadily. Some say the 
greenhouse effect is happening right now, some say it is only appearing to 
happen because of the location of weather stations-. There have been many 
questions asked in this section with some very good answers for both sides. 
Rather than summarizing them here, why do not you look through the global 
warming questions and see if maybe your question has already been answered.