What is the upper limit for safe levels of carbon dioxide in the atmosphere?
350
In order to reverse or control the effects of climate change, scientists have suggested that we need to limit our carbon release in the atmosphere to 350 parts per million (350 ppm).
Sadly, we have surpassed that threshold and are now at 400 parts per million, rising by 2 parts per million every year. This has caused an increase in global temperatures of 1 degree Celsius, warming of the poles, acidification of the seas and coral bleaching, as well as a reduction in the habitat of numerous species.
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The upper limit for safe levels of carbon dioxide in the atmosphere is generally considered to be 350 parts per million (ppm). However, current levels have exceeded this threshold, reaching around 415 ppm as of 2022.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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