No. There is (was) no conspiracy.
Climatologists can no more “cover up legitimate science” than biologists can “cover up legitimate science” from the creationists.
It’s physically impossible.
See here and here.

Even if the climate change hypothesis is true…

No. Climate change is not a “hypothesis”.
Nor is it “just a theory”.
Real-time on-the-ground observations have already been made. Painstaking time-lapse photography taken.
Measurements done of multiple different lines of evidence covering many decades involving all of the physical sciences.
All of them.
No exceptions.
(Geology, glaciology, atmospheric science, chemisty, physics, meteorology, vulcanology, oceanography, biology etc.)

Every single scientific community on the planet is on board with the science of climate change.
That consensus was carefully built up via the process of peer review.
No short cuts. No hanky-panky.

The science has been done the boring old-fashioned way.
Treat claims to the contrary with the same suspicion as you would treat creationist claims trying to denigrate biology or anti-vaxxers taking pot shots at modern medicine.
Compare these two propoganda pieces.
Two peas in a rotten pod.
That’s not how science is done.

NASA.
Doesn’t get much better than NASA for good science.
Do they accept the science on global warming and climate change?
Oh yes.
NASA didn’t lie to you about the moon landings and they are not lying to you about climate change.
There is no global conspiracy of scientists.

Look at what the scientific community has to say.
Go directly to their websites and avoid the spin.
NOAA, USGS, The Royal Society, RMET, CSIRO, British Antarctic Survey, NAS, AAAS, AGU….they’re all good. Go ahead and pick your own favourite one. They will all tell you the same thing.

Climate change is real.
We’re responsible for it.
It’s bad.

Get your biology information from biologists.
Get your medical information from doctors.
Get your climatology infromation from…climatologists.

Please find out about how climate change deniers operate.
Look at the history. It’s all well documented and verifiable.
Here and here.