
It is estimated that the global population was less than 1 billion at the beginning of the 19th century. Today, 200 years later, the world’s population has soared to 7.2 billion, and is expected to reach 10 billion by 2050. As a result, humans have to compete with all other creatures for natural resources. Human activities have caused global warming which caused the world many problems. One of them is the drastic decrease in worker productivity due to hot weather, the other is serious wildfires. In 2019, Australia’s bushfires caused 17.1 million hectares of scorched earth (about 155 Hong Kong), and 1 billion animals suffered from the disaster. In 2020, the wildfires on the west coast of the United States killed dozens of people, the smoke even spread to Europe, which is 8,000 km away.
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