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Depends what you mean by OK. It is grammatical, the meaning is apparent, and you would not be thrown in gaol for writing it. And (written later) I see that @Wilk has found some examples of “pregnant with crisis”.

However I would not write it myself as I find it rather forced and unnatural. Perhaps the psychological basis of this is a positive association of pregnancy with life, rather the negative crisis. The sort of metaphor I would use for a latent crisis would be something like:

Seething under the surface lies an impending crisis

Clearly it depends on the literary style of the original, but if I were translating it into English, if at all possible, I would abort the pregnancy and write something straightforward, like:

The world is on the verge of an environmental crisis.

or

The world is on the brink of an environmental crisis.

I would try to translate the idea, not the individual words.

I would not write pregnant with a crisis, but simply "pregnant with crisis". Google books turns up this usage a lot. Example -

Against the grain, Terry Eagleton 1985

'Modernism' as a term at once expresses and mystifies a sense of one's
particular historical conjuncture as being somehow peculiarly pregnant
with crisis and change.

It is only ever "pregnant with crisis". My google turned up many instances of that but never with any modifier of crisis: not "pregnant with * crisis". Except "pregnant with sickle cell crisis" which is another thing completely.

As an English speaker, I think a better word is gestating.

• The world seems to be gestating an environmental crisis.

Gestating implies pregnancy, but also that something is growing but not yet happened.

How about changing the metaphor? I doubt pregnancy is pertinent to the context.

• The world seems to be brewing an environmental crisis.




• The world seems to be racing towards an environmental crisis.

Both of the above sentence imply that something is actively going on now. Not like "if you fall you're going to get hurt." If you don't fall then you don't get hurt.

Yes, it is idiomatic:

pregnant with (something)

Full of, or fraught with, or having a lot of something.

• Just before naming the guilty party, he gave a pause that seemed pregnant with meaning, and I wondered whether he was telling me the truth.




• Her speech was pregnant with emotion, and her eyes brimmed with tears as she spoke.

(The Free Dictionary)

ripe for (something) TFD

In the condition that most invites or calls for something to happen, or particularly ready or in need of something.

Example

The world seems to be ripe for an environmental crisis.

The original source appears to be using pregnancy as a metaphor.
The author has in mind a particular environmental crisis that is developing and will come into full existence at some future time.
Metaphorically, that crisis is gestating within the world,
and the world with give birth to that crisis at that future time.

The problem in translation is that there already is a figure of speech in English
that uses the words "pregnant with," and it conflicts with the metaphor.
The Free Dictionary definition of this phrase has already been cited;
as shown in the examples given for that definition,
"pregnant with" is expected to be used with an abstract noun such as
meaning or emotion, or possibility.

Compare this passage from the definition of conceive at
vocabulary.com:

Latin roots for conceive (by way of French) point to "take into" either "the womb" or "the mind." An idea is sometimes called "a seed" or "the seed of an idea," and conceive means to produce something from inside the mind — or to become pregnant. Another expression is "pregnant with ideas" or "pregnant with possibilities," ...

Now see how this figure of speech sets the reader's expectations:
we expect it to be followed by something abstract and uncountable (such as meaning) or some numerous collection of things (such as possibilities).
So it is very jarring to suddenly be presented with a single, specific thing
(the particular environmental crisis with which the author is concerned)
as the thing the world is pregnant with.
Because of this, I think the literal translation is likely to be misunderstood.

Perhaps you can come at the same metaphor using different phrasing:

The world seems to be due to give birth to an environmental crisis.

I can't beat David's answer (translate the idea, not the words), but there is another reason to avoid the word pregnant. I would avoid anything that could be perceived as sexist. Political correctness is important in many countries.

I agree with those that note that this sounds slightly odd to a native speaker.

But as part of an extended metaphor, it would come across just fine:

The world seems to be pregnant with an environmental crisis. The moment of its birth will signal death for all we hold dear.

although here "seems to be" would feel too weak.

It's awkward the way it's written

The world seems to be pregnant with an environmental crisis.

'pregnant' tends to be something you are or aren't, so you're weakening it with 'seems to be'. While the idea of 'pregnant' does get across that we're waiting for the action to happen, it would work better as a definitive statement, combined with an adjective indicating we're waiting for something to happen. We should shift that uncertainty to the even itself

The world is pregnant with many potential environmental crises

I'm not sure that it's as universally awkward in English as many are making it out to be. "Pregnant" has precisely this usage, and other usages that don't specify something positive, as noted by other answers.

From the simple pregnant pause, as in "Mid-conversation, a sudden full pregnant pause exclaimed the awkwardness of the meeting," to pregnant with fear, which definitely has a negative connotation.

There's pregnant with life not even meaning an animal pregnant with offspring. How about pregnant with disaster (though the source isn't a personal preference).

Pregnant with calm, as in:

The hills have no ruggedfeatures; they are softened with foliage and thewhole place is pregnant with calm beauty andrestfulness.

In fact, search Google for "Pregnant with [...]" using the double quotes and replacing [...] with all manner of noun, and you're sure to find examples of this usage. While one single term, e.g. pregnant with crisis may itself not be extremely common, the usage with various nouns actually seems to be.

Yes, there already is a closely-equivalent expression in the English language which you can use in this case. The expression, however, is not "pregnant with", but "pregnant for".

You can see an example of it in use here:

"the situation is pregnant for an accident with these conditions" (The Badger Herald)

This is not such a common expression, but it should be safe to use, as your readers who are quite well-read will recognize it and have no problem with it at all, and your readers who are not so well-read are probably already used to being confused by things they read anyway.

If you ultimately choose to avoid use of the word "pregnant", the next best choice is "ripe for", already suggested by another user herein.

If you do a web search for the words "pregnant for change" (in quotes, of course), you will see that this specific variant of the expression is actually fairly commonly used.

Edit:

I don't yet have enough reputation points to comment on anyone else's post here, so I am limited to this space, but...

for those herein who are suggesting "pregnant with ...", although we certainly have that usage in English, the meaning doesn't match what the OP is looking for. "Pregnant with" implies that the thing ALREADY has this trait, and in abundance. To suggest that a thing is in a state such that something is likely to soon occur, though, "pregnant with" would not be used. As I have already stated "pregnant for" is what you want in that situation. (Or "ripe for" if you prefer.)