Читать книгу Climate Change For Dummies - Elizabeth May - Страница 14

Global warming is a very complex issue that you can’t totally understand without looking at the ifs, ands, or buts. Scientists have been certain for decades that the rapid changes to climate systems are due to the buildup of GHGs. With every new scientific report, they’re more certain and more concerned that changes must be made to avoid the worst-case scenarios. Other elements play a role in shaping the planet’s climate, however, including the following:

 Cloud cover: Clouds are connected to humidity, temperature, and rainfall. When temperatures change, so does the cloud cover — and vice versa.

 Long-term climate trends: The Earth has a history of going in and out of ice ages and warm periods. Scientific records of carbon dioxide levels in the atmosphere go back 800,000 years, but people can only give educated guesses about the climate earlier than that.

 Solar cycles: The sun goes through a cycle that brings it closer to or farther away from the Earth. This cycle ultimately affects the temperature of this planet and thus the climate. However, scientists have eliminated solar cycles as a factor in current warming.

We go over these other issues in greater detail in Chapter 3.