Research indicates that carbon dioxide levels in the pre-industrial era were 280 parts per million; today they are 350. ... One current report states that the last three winters represent the warmest trend ever in North America. ... However, this concept of substitution would be severely tested by a depletion of the world's oil supply, since the structure of our modern industrial society is so dependent on the presence of oil. ... Studies of certain lakes in Scandinavia indicate that acid-sensitive species of microorganisms are present in much lower numbers than before the Industrial Revo...

• Word Count: 1531
• Approx Pages: 6
• Grade Level: Undergraduate

Increasing levels of greenhouse gases, like carbon dioxide (CO2), in the atmosphere since pre-industrial times have been well documented. ... The remaining emissions are from methane from wastes in landfills, raising livestock, natural gas pipelines, and coal, as well as from industrial chemicals and other sources. ... However, during the Industrial Revolution, we began altering our climate and environment through changing agricultural and industrial practices. Before the Industrial Revolution, human activity released very few gases into the atmosphere, but now through population growth, fossi...

• Word Count: 3240
• Approx Pages: 13
• Grade Level: Undergraduate