Ah, the rallying cry of the Iron Age Restoration Society. If all the passengers on the Titanic had been issued with teaspoons and told to use them to bale after it hit the iceberg "something would have been done". It would of course have had no effect whatsoever on the final outcome nor would it have delayed it by any measurable amount.
Changing light bulbs has the same order of magnitude of impact as issuing teaspoons on the Titanic would have. If the population of the UK was entirely eliminated next Wednesday it would have no measurable effect on the progress or otherwise of climate change. You don't solve a problem by ignoring its causes and instead playing around with stealth taxes in the margins with pious mutterings of "every bit helps" or "everyone must do their bit" to rally the ignorati.
If "something has to be done" then that something must involve massive population reduction worldwide and I don't see any of the greenygroups being brave enough to campaign for that. There is nothing more hypocritical than green evangelists with children.