Are we seriously going to go against that just because HeS a RePuBLiCaN???
No. We're going to go against that because "have more babies so they can find solutions" is another way to hold off on solving the problem, this time on a generational timescale. Gaetz and Alexander's proposals have the same problem, because the Republican playbook is to stay ten steps behind the problem until they leave office or public interest stalls out. That is, in a sense, the core functionality of conservatism.
Solutions exist. They are just not solutions the plutocrats' lapdogs are willing to accept.
In regards to climate change we're probably running out of generations even able to solve the problem.
It's going to soon get to the point where our energies are better off focused on adapting and preparing than trying to stop it entirely.
We're already at that point. The problem is that we still have to stop it at some point or else it'll get beyond the point where we can adapt and prepare.
There's a bunch of admittedly questionable and not always 100% clear tipping points that could lead to a runaway climate change that would likely be impossible to adapt to. If it's not methane being released from warming land/oceans, then it's ocean acidification, or loss of arctic albedo, or thermohaline shutdown, or... there's several more that are popular, and then probably hundreds of less and less likely scenarios.
But enough of those are plausible I'd say it's something we're going to need to stop at some point rather than just let it keep going and hope we can handle it. At the very least I don't expect to live long enough to see extinction on the table personally, but I'd rather future generations have a chance. Although without that to consider......
Perhaps babies aren't the solution, but the problem. Without a generation to follow us there's really no reason to worry.