Solar power drives renewable energy investment boom in 2014

Global clean energy investment leapt 16% in 2014 led by solar power surge in US and China – but Europe lags behind

Fashion meets renewable energy – clothes that charge your smartphone

From fibres that convert sunlight into electrical energy, to uploading your kinetic energy to a green energy bank, the worlds of fashion and technology are merging

• How can technology advance sustainability in fashion? – live online chat on Tuesday 5 August, 1pm BST