Energy
About forty years ago, some scientists put out the idea that the climate was changing and the world was heating up due to human use of fossil fuels and the release of carbon dioxide gas. According to them, the gas was trapping the sun's heat, causing the earth to heat up to catastrophic levels. Hot summers, cold winters, more severe storms, more fires, and a whole host of other problems were proposed as consequences of increases in carbon dioxide levels.
Politicians, sensing an opportunity, jumped on the bandwagon and started enacting laws restricting use of fossil fuels, mandating such things as carbon trading and carbon taxes, development of "green" energy sources including wind and solar, and generally working to eliminate an abundant source of energy that powered almost every aspect of our economy.
Our governor saw a perfect opportunity to virtue signal by mandating phase out of gas powered cars, funding solar and wind farms, and generally forcing transition to electricity that we didn't have the capacity to produce or distribute.
While their actions have had no effect on climate, they have had extreme consequences in terms of increasing expenses, job destruction, and huge wealth transfers from ordinary working folk to large government promoted and funded "green" projects that have enriched the connected few at the expense of the rest of us.
Instead of better transportation, we got a high-speed train to nowhere. Instead of clean energy, we got ugly wind farms and solar panels covering the landscape. After years of operating history, we now know that the energy that these windmills and solar panels produce will never exceed the energy used to manufacture, maintain, and ultimately retire them.
California has led the nation in its legislative fight against climate change, with nothing to show for it except a crippled economy, job killing regulations, an environmental mess, and not so much as a tenth of a degree reduction in the temperature.