Hear, hear — Earth Hour Is a Colossal Waste of Time—and Energy by Bjørn Lomborg:
The organizers say that they are providing a way to demonstrate one’s desire to “do something” about global warming. But the reality is that Earth Hour teaches all the wrong lessens, and it actually increases CO2 emissions. Its vain symbolism reveals exactly what is wrong with today’s feel-good environmentalism.
And:
Electricity has given humanity huge benefits. Almost 3 billion people still burn dung, twigs, and other traditional fuels indoors to cook and keep warm, generating noxious fumes that kill an estimated 2 million people each year, mostly women and children. Likewise, just 100 years ago, the average American family spent six hours each week during cold months shoveling six tons of coal into the furnace (not to mention cleaning the coal dust from carpets, furniture, curtains, and bedclothes). In the developed world today, electric stoves and heaters have banished indoor air pollution.
Similarly, electricity has allowed us to mechanize much of our world, ending most backbreaking work. The washing machine liberated women from spending endless hours carrying water and beating clothing on scrub boards. The refrigerator made it possible for almost everyone to eat more fruits and vegetables, and to stop eating rotten food, which is the main reason why the most prevalent cancer for men in the United States in 1930, stomach cancer, is the least prevalent now.
Electricity has allowed us to irrigate fields and synthesize fertilizer from air. The light that it powers has enabled us to have active, productive lives past sunset. The electricity that people in rich countries consume is, on average, equivalent to the energy of 56 servants helping them. Even people in Sub-Saharan Africa have electricity equivalent to about three servants. They need more of it, not less.
I interviewed Alex Epstein about “How Coal and Oil Improve Our Lives” on the 
