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I'm stumped on this sentence.

一度環境中に増えた二酸化炭素などの長寿命な温室効果ガスは、能動的に固定しない限り、約100年間（5年–200年[9]）にわたって地球全体の気候や海水に影響を及ぼし続けるため、今後20–30年以内の対策が温暖化による悪影響の大小を大きく左右することになる[10]

My best attempt at this so far is. (If anyone could improve on this, it would
be a big help.)

Greenhouse gasses like carbon dioxide with a long lifetime in the atmosphere,
once released, will continue to have an effect on the climate and sea level
over approximately 100 years until their emissions are limited. For this
reason, the action taken on climate change in the next 20-30 years will have a
big influence on the degree of their harmful consequences.

Edit:

I have updated the translation to accommodate the comments and answer below.

Greenhouse gasses like carbon dioxide with a long lifetime in the atmosphere,
once released, will continue to have an effect on the climate and the oceans
over an approximately 100 year period unless actively fixated. For this
reason, the action taken on climate change in the next 20-30 years will have a
big influence on the degree of such harmful consequences.

Edit 2:

Sorry; this is a reading comprehension question, not a translation question. I
wasn't looking for the right translation or for proofreading. 能動的に固定しない限りwas
the main barrier to my understanding, since it involved very technical
Japanese and my dictionary wasn't very helpful.

However, my question was answered.
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question
reading-comprehension
Clarifying another sentence from the global warming article
能動的に固定しない限り is "unless actively fixated". In this context, 固定 ("to fixate")
refers to actively removing CO2 from the air using [something like
this](https://www.scientificamerican.com/article/new-reusable-materials-pull-
co2-from-air/) or
[this](http://tenbou.nies.go.jp/science/description/detail.php?id=26).

The excerpt says CO2 is "gas with a long lifetime", not "gas with an unlimited
lifetime". Doesn't that mean the author thinks CO2 will eventually disappear?
I think the cited article [9] explains where "100年" came from.

Lastly, although this is a minor problem, 温暖化による modifies 悪影響, not 対策.
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answer