"Yes, sunshine and wind are obviously clean but the turning either of those into electricity is anything but a clean, harmless process. The Greens, here, stomp on any suggestion of mineral extraction, but their brave new world requires massive increases in mining of metals and rare-earth minerals. This comes with ecological and social consequences. Based upon a 2017 World Bank report, to get to the zero-carbon nirvana would require building enough solar and wind plants to generate 14 TW of electricity by 2050." Columnist posts at New Zealand BFD blog