China Education Equipment Purchasing Network News: The increasingly high-tech life has brought a lot of threats to our health. Not only are we using it, but even the places where we live are full of things that are harmful to our health.
Methane is a greenhouse gas that has a significant warming effect on the climate (only water vapor and carbon dioxide are more important than it), however, people still do not understand the factors that affect its concentration in the atmosphere. In particular, its rapid rise in concentration in the mid-20th century gradually (but temporarily) slowed down at the turn of the century, and the reason for this decrease in its growth rate is still under debate. Two new studies have provided clues to this mystery, but their conclusions are conflicting. Fuu Ming Kai et al. Measured the difference between methane concentration and isotope characteristics in the northern and southern hemispheres, and concluded that the decrease in the degree of microbial activity in wetlands is the main reason. Changing rice farming methods seem to explain about half of the Northern Hemisphere trend. In contrast to this conclusion, Murat Aydin et al. Combined the measurement of methane bound in Antarctic ice with a simple atmospheric model, and concluded that the slowdown in the rate of increase of methane concentration in the atmosphere The decrease in methane emissions from fossil fuel production. In the News and Views article, Martin Heimann discusses the different findings from these two studies. (Xie Yinan / Editor)
Guide to foreign journals:
The reason for the greenhouse effect: The increase in the greenhouse effect is mainly due to the excessive burning of coal, oil and natural gas in modern industrial societies. These fuels emit a large amount of carbon dioxide gas and enter the atmosphere. Carbon dioxide gas has the functions of heat absorption and heat insulation. The result of its increase in the atmosphere is the formation of an invisible glass cover, so that the heat radiated by the sun to the earth cannot be dissipated into the outer space. As a result, the surface of the earth becomes warmer. Therefore, carbon dioxide is also called a greenhouse gas.
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