It would not matter any if nations passed what they might call "The Law of Gravity", since that is already the law whether we like it or not.
However, it would be a sane gesture to acknowledge a superior, immutable law.
That is, acknowledge natural law which always issues its own equal-justice-for-all punishment each time it is violated.
In that vein, Bolivia is considering passing national laws which declare that the environment has the same rights as human beings:
(There Otta Be a Law). Like gravity, the law of the environment already exists, in that, the law of this planet is that if we destroy nature we destroy ourselves, seeing as how we too are nature.
Bolivia is set to pass the world's first laws granting all nature equal rights to humans. The Law of Mother Earth, now agreed by politicians and grassroots social groups, redefines the country's rich mineral deposits as "blessings" and is expected to lead to radical new conservation and social measures to reduce pollution and control industry.
But hats off the Bolivians who are bringing focus to the laws that really, really matter.