Libel law already does that and this would do it to a far lesser degree.
Libel is a different case. Laws vary from place to place, but assuming a plaintiff had to establish a) that the defendant made a claim and b) that the claim was harmful to the plaintiff, presumption of innocence could go either way: Should it be presumed the plaintiff is 'innocent' of those accusations and undeserving of the harm which has been shown to have been inflicted, or should it be presumed that the defendant is innocent of the accusation? Furthermore even if the claim was actually false, often it is not punishable if it could be shown to have been a reasonable belief which the defendant had attempted to ascertain beforehand, which would require the defendant to make their case regardless. And putting the onus on the defendant by no means universal even given these special circumstances of libel cases.
In the case of scientific information there is no ambiguity over presumption of innocence, unless unqualified negative assertions were made about particular individuals/groups - which would be treated as libel anyway.
All that you would need to do is show that your position is reasonable and that the other side cannot show that you are flat out lying. Easy to understand and easy to opperate in law.
Unless we're talking about a biology teacher trying to convince the jury in a backwater Alabama court that evolution is "reasonable." But that's not even the point: Scientists should not be compelled to waste a single second of their time preparing a defence for frivolous prosecutions under your law - they should be free to
sleep through the proceedings if they want, and walk out scott free if their accusers cannot demonstrate fraud or intentional falsehood. (Even assuming your proposal were a good idea in the first place, which it's not.) That is a
basic human right as defined by the Universal Declaration on Human Rights, and you seem intent on violating it in the name of your anti-scientific crusade.
I think it would stop NASA saying that Greenland is losing ice or that it is possible to have a 300Gt ice mass loss per year from Greenland due to melting.
That's about 20cm off the top, averaged over the surface of the ~2km-deep Greenland ice sheet. Remember that demonstrated poor mathematical ability of yours?
I thought we might be approaching an understanding, but really you're all over the place with what you want your law to accomplish. If you're ruling out even NASA as a credible source of scientific observations, how the hell is any scientist supposed to justify anything now that you've stripped them of their right to presumption of innocence?
And you've said that if IQ is not tied to skin pigmentation you would want your law to get rid of the very idea that different races score differently on IQ tests, even though in some cases that can be a circumstantial fact!
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And I'm going to put this separately, because you
still haven't addressed the fact that your proposal would lend superficial credibility to each and every bit of misleading quasi-scientific propaganda which skirts around the law, no matter how nefarious or absurd the agenda, simply because many people would assume "if it wasn't true they couldn't publish/get away with it."
You pretend that you want to reinforce the 'authority' of science or somesuch, yet from the answers which you have (very reluctantly) provided it seems that if they were implement your proposals could both have a chilling effect on scientific research itself, yet also reinforce misleading propaganda!