Agence France-Presse: The US ambassador to Britain told the BBC in an interview Sunday that the row over leaked emails from a key English climate research unit had had no effect on Washington’s position on global warming. Louis Susman said US President Barack Obama was committed to reforms at the Copenhagen summit on climate change. Leaked emails from the University of East Anglia’s Climatic Research Unit, a world leader in the field, sparked claims that scientists were trying to suppress data which …