Energy harvesting that are able to operate in higher temperature gradients, and that can conduct electricity well without also conducting heat (something that was until recently thought impossible ), will result in increased efficiency. Future work in thermoelectrics could be to convert wasted heat, such as in automobile engine combustion, into electricity. This type of harvesting is based on the changing capacitance of vibration-dependent capacitors. Vibrations separate the plates of a charged variable capacitor, and mechanical energy is converted into electrical energy. Electrostatic energy harvesters need a polarization source to work and to convert mechanical energy from vibrations into electricity. The polarization
Energy policy of China to 2009. However, from 2010 to 2015 China reduced energy consumption per unit of GDP by 18%, and CO emissions per unit of GDP by 20%. On a per-capita basis, it was the world's 42nd largest emitter of greenhouse gases in 2014. China is also the world's largest renewable energy producer. China is the largest producer of hydroelectricity, solar power and wind power in the world. Energy policymaking in China is largely decentralised. There has been no Ministry of Energy since it was dissolved in 1993, and it was only in 2002–2003 that serious governmental dialogue on re-centralising energy administration