top appointment

'There is already widespread harm ... occurring from climate change. This is not just a problem for our children and our grandchildren.'

John Holdren, Harvard physicist and newly-appointed chief scientific adviser to the Obama administration. In his weekly radio address, Barack Obama shows how much he intends to differ from his predecessor,

'It's about ensuring that facts and evidence are never twisted or obscured by politics or ideology. It's about listening to what our scientists have to say, even when it's inconvenient – especially when it's inconvenient.'