BBC: More than 350 cities across Europe – including 15 in the UK – have signed a “covenant” committing them to cuts of more than 20% in CO2 emissions by 2020. The “covenant of mayors” was signed at the European Parliament in Brussels. The EU as a whole aims to achieve a cut of 20% in greenhouse gas emissions by 2020. The CO2 Emissions Trading Scheme (ETS) will play a key role in that. But the EU’s emissions allowances have hit a record low of 9.5 euros (£8; $12) a tonne, …