Builders in California are going back to school to learn how to cope with a new regulation which says that all new homes completed after 2020 must produce as much energy as they consume. The same regulation applies to all commercial buildings completed after 2030.
Of course the assumption is that buildings will consume very little and therefore need to produce very little ... but I haven't seen the detail and how carefully worded it is. A building that used lots of energy but produced lots of energy might meet the 'letter of the law' but would certainly not meet the 'spirit of the law' and could have a large carbon footprint. Let's assume they've got it right and rejoice.
(Quick law is often bad law!)
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