Climate Change Bill [HL]

I have a question for both opposition Front Benches. If this objective is to be put in the Bill, plainly it must be capable of being decided in court whether that objective has been fulfilled. What is the pre-industrial level? How does one know what the pre-industrial level was? Even more fantastically, what are the ““pre-industrial levels””—in the plural—as appear in both proposed new clauses? How on earth can an average temperature increase be of more than 2 degrees above various pre-industrial levels? The temperature can only possibly have risen above a specific pre-industrial level that is capable of absolute ascertainment.