Answer to Question #200194 in Physical geography for Marie

Question #200194

Global Climate Change write your opinion about it in 350 words

Expert's answer

Global warming is an observable fact, it does not depend in any way on the opinion of scientists or politicians. Just look at the dynamics of the average annual temperature on the planet. For example, it is well noticeable from the rise in the sea level, which is recorded in several independent observation lines. The rise in the level is primarily due to the simple thermal expansion of water - like any substance, it expands when heated, which, on a global scale, leads to a rise in ocean level. There are many other measurements, too: declining snow and sea ice in the Arctic, melting glaciers, and more.

Although the climate has indeed been constantly changing, and for 4.5 billion years of the existence of the Earth, it was both much warmer and much colder than it is now, if we collect all the available values of the global temperature rise in one timeline, we can see that the growth rate has never been so high as today.

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