Re "Atmosphere always changing" (Letters, Feb. 19): During the Cold War when the United States was developing heat-seeking missiles, it was discovered that carbon dioxide in the atmosphere interfered with missile tracking because it trapped radiant heat.
When you burn fossil fuels, they release carbon dioxide. With the increased use of fossil fuels in the industrial revolution, carbon dioxide levels in the atmosphere have increased by at least 25 percent in the last century. This is the most rapid change in carbon dioxide levels in the last 800,000 years.
Climate studies have undeniably shown that as the level of carbon dioxide in the atmosphere rises the earth's temperature rises correspondingly. The earth's temperature is rising, the oceans are becoming more acidic and the glaciers are melting. Humans caused a change in atmospheric conditions during the Dust Bowl simply by plowing up the grasslands. To deny this is truly naive.
-- Dave Mauck, Sacramento