Some scientists think that Earth goes through natural cycles of warming and cooling. The difference in the current cycle of the Earth's temperature change is that the Earth is heating quicker than in prior natural cycles.
The warming of Earth is not only because of biological reasons like volcanic eruptions, forest fires, and such but also because of the human actions which add up to it. The smoke from factories, the use of aircon, refrigerator burning of fossil fuels, etc. They all donate to the planet's more rapid warming making it more difficult for human societies and the natural world to adapt.
More about rapid warming of the Earth:
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