Earth has warmed by about 1°F over the past 100 years. But why? And 16. ?
Well, scientists are not exactly sure. The Earth could be getting warmer on its own, 17. many of the world’s leading climate scientists think that things people do are helping to make the Earth warmer.
Global warming refers to an average increase in the Earth’s temperature, 18. in turn causes changes in climate. A 19. Earth may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans. When scientists talk about the issue of climate change, their 20. is about global warming caused by human activities. It is because they are sure about the danger of the green house effect.