Answer:
For a period of at least three decades.
Explanation:
It is considered as climate change the variations of temperatures that the planet has had, these changes can be for a prolonged time (decades). Some time ago, the earth began an increase in temperature, known as global warming; this has caused different effects on the planet, for example, more improvements in temperatures.
Scientists continue to investigate climate changes by comparing past and current changes; they want to find solutions to maintain a balance to keep temperatures on the planet.
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