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Hi!
I think there is now enough evidence to say that human activity has been affecting and changing the climate.
For example, studies based on past climates have shown that, on average, global temperatures should still be cooling today, but actually we know that they are warming. This is because of the influence of greenhouse gases.
The Earth experiences periodic changes in its climate, which at different times has been both warmer and colder than it is today. However, the speed at which these changes are happening at present day and the rates of warming we have been experiencing have not been seen before (based on the reconstruction of past climates).
This is part of the evidence suggesting that human activities have influenced the climate.
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