The Greenhouse Effect Is a Natural Phenomenon That Keeps the Earth's

question 37

Multiple Choice

The greenhouse effect is a natural phenomenon that keeps the earth's surface warm. Without greenhouse gases-water vapor, carbon dioxide, methane, nitrous oxide, halocarbons, and ozone-life as we know it wouldn't exist. The current problem is that

• A) it is difficult to distinguish between climate change and global warming.
• B) the atmospheric concentration of greenhouse gases has reached its highest level in 400,000 years and will continue to rise, as will global temperatures, without actions to slow it down.
• C) scientists cannot agree on a general model of how the greenhouse effect went from being a positive to a negative and life-threatening force.
• D) global warming actually benefits 90 percent of the world's population, so it is difficult to mobilize the will to address the anthropogenic causes of climate change.
• E) most scientists dispute the anthropogenic reasoning for high concentrations of greenhouse gases.