Laws aren’t based on consensus or age as we have plenty of Laws that are known to be wrong and stuff gets called a law fairly early.

F=MA fails really obviously at high velocity but the error doesn’t go away at low speed it just becomes small enough to be ignored. Even the most known Law of conservation of energy fails in expanding space time.

The basic rule of thumb is can you write a useful equation? And for climate change it’s just too complex for that.