Tech giants among others will have to disclose carbon emissions under new California law

A first of its kind Californian law will soon require companies with annual revenues above $1bn to disclose carbon emissions - both direct and indirect.

The law was signed last weekend by Governor Gavin Newsom and is catchily known as Senate Bill 253 (SB253.) It doesn't sound at first like a wildly exciting development, but SB253 is a radical piece of legislation and if enacted as intended it is likely to have a significant and positive impact on global emissions.