British scientific experts have made a major breakthrough in the fight to save the natural world from destruction, leading to an international effort to safeguard a global system worth at least $5 trillion a year to mankind. Groundbreaking new research by a former banker, Pavan Sukhdev, to place a price tag on the worldwide network of environmental assets has triggered an international race to halt the destruction of rainforests, wetlands and coral reefs. With experts warning that the battle to stem the loss of biodiversity is two decades behind the climate change agenda, the United Nations, the World Bank and ministers from almost every government insist no country can afford to believe it will be unaffected by the alarming rate at which species are disappearing. The Convention on Biological Diversity in Nagoya, Japan, later this month will shift from solely ecological concerns to a hard-headed assessment of the impact on global economic security.