Despite these scientific findings, however, there was considerable disagreement within the scientific community about global warming throughout the 1980s and 1990s. Many scientists accepted that a warming trend was likely but believed that average temperatures would rise only a few degrees in the next century—not a significant change that seemed to require immediate policy changes. In addition, a number of scientists were equally concerned about the effects of smog—air pollutants from fossil fuels that could potentially block sunlight and cause the world to cool, rather than heat up. In fact, a cooling trend was recorded between the 1940s and 1970s, when air pollution became a serious problem in developed countries such as the United States. No one was completely sure whether the Earth would dip into another ice age or heat up as global warming theory predicted. Most scientists at this time agreed only that the Earth's climate was very complicated and that more research was needed before accurate predictions about the effect of human activity on climate change could be made.
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.