The director of Friends of the Earth, Tony Juniper, said the G8 leaders had reached agreement on climate change.
But the announcement of the deal, which had been expected this afternoon, has been postponed until tomorrow because of the bombings in London. Mr Juniper called them "unspeakable acts of random violence".
He added: "Unsurprisingly this has taken the attention of the world away from Gleneagles to London. It is bound to have an impact on the way the summit will seek solutions to ending poverty and fighting the effects of climate change. In both respects this appalling violence is a tragedy."
