We also know that human activities—primarily the burning of fossil fuels—have increased the greenhouse gas content of the earth’s atmosphere significantly over the same period. Carbon dioxide is one of the most important greenhouse gases, which trap heat near the planet’s surface.

　　The vast majority of climate researchers agree with these overall findings. The scientific disagreements that do still exist primarily concern detailed aspects of the processes that make up these largely accepted general themes.

　　You can think of this website as a window into the world of scientific research. In this primer, you’ll find a general discussion of the physical processes underlying the earth’s climate, an outline of the kinds of data that may shed light on how the climate is changing—and the role of human activity in these changes—and a description a some of the questions and uncertainties that researchers continue to explore. This primer is organized into four interconnected sections: the Atmosphere; the Hydrosphere(水圈); the Cryosphere(低温层); and the Biosphere(生物层).

　　1. We know from the text that “IPCC”___.

　　engages in the climate and changes about the earth.

　　is a group by scientists who like to walk around the moon

　　works in the World Meteorological Organization

　　often greets the passers-by from the outer space

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