In another bid to reduce carbon emissions and energy consumption, the European Union is requiring all new buildings to produce nearly as much energy as they consume starting in 2020. Building codes continue to vary greatly from country to country, leading to concerns that most builders won't have the skills to live up to the new requirements. In addition, the E.U. mandate does not provide incentives to renovate existing buildings, which will continue their extravagant consumption of energy for decades. But calls from environmentalists and insulation companies for subsidies to kick-start refurbishment programs are falling on deaf ears at a time when most European governments are cutting budgets to deal with bulging deficits.