Actually it really does matter. The US collects far more of this data than anybody else and archives far more of it.
Losing that collection or archive would be a disaster for science and a loss for all of humanity. Destroying that data would be reminiscent of ISIS destroying relics in Palmyra except that destroying that data jeopardizes our future.
We know already that CO2 and other gases cause climate change and we understand the mechanism. I think that most of us would probably also agree that the earth is a sufficiently complex system that predicting accurately what effects we will see when is impossible. We expect to see more droughts, bigger storms and rising sea levels - but we can't really predict very accurately how big those things will be when. By the time we have accurate models it will be too late.
We know that we need to act now. Understanding climate change is not the most important research out there; what's important is developing technologies and industries to reduce our emissions. That research would be what I fear losing.
But "we need to act now" can lead to a lot of ineffective policies and practices that won't lead to the most impacting outcomes long term. I think reciprocal clean working environments as part of trade negotiations could go farther than a lot of the attempts so far. I also feel that no participating country should be exempt, beyond a reasonable grace period (2-3 years).
It's also worth considering the impact of some movements... as an example, there's significant impact in creating/shipping and replacing batteries on a large scale. It may not make as much sense compared to more efficient engines, and even additional looks at other engine techniques.
I find pollution relatively abhorrent on its' own though... recently driving through west Louisianan/east Texas and my initial thoughts as to the painful to breath air there was how can this be allowed to persist. I have mixed feelings all around, I just don't want to spend a lot of taxpayer money on ill-advised and lesser impacting processes. We do too much of that already.
Losing that collection or archive would be a disaster for science and a loss for all of humanity. Destroying that data would be reminiscent of ISIS destroying relics in Palmyra except that destroying that data jeopardizes our future.