Euan Mearns, geologist: It is important to recall that well over $1,700,000,000,000 ($1.7 trillion) has been spent on installing wind and solar devices in recent years with the sole objective of reducing global CO2 emissions. It transpires that since 1995 low carbon energy sources (nuclear, hydro and other renewables) share of global energy consumption has not changed at all. New renewables have not even replaced lost nuclear generating capacity since 1999. ZERO CO2 has been abated and the world has done zilch to prepare itself for the expected declines (escalating costs) of fossil fuels in the decades ahead. If this is not total policy failure, what is?