Document Type
Argument Essay
Publication Date
1989
Excerpt
Atmospheric scientists have long known that there are broad historical cycles of global warming and cooling; most experts believe that the earth's surface gradually began warming after the last ice age peaked 18,000 years ago. But only recently has it dawned on scientists that these climatic cycles can be affected by man. Says Stephen Schneider of the National Center of Atmospheric Research in Boulder, "Humans are altering the earth's surface and changing the atmosphere at such a rate that we have become a competitor with natural forces that maintain our climate. What is new is the potential irreversibility of the changes that are now taking place,"
Recommended Citation
Lorentson, Matt, "Control of the Greenhouse Effect (1989)" (1989). The Valpo Core Reader. 425.
http://scholar.valpo.edu/core_reader/425