Chewing gum-maker Wrigley has resisted calls from a number of UK councils to help pay for cleaning gum off streets. The US group has instead offered to make an undisclosed "significant contribution" to a government fund to raise awareness about littering. Local authorities have said it costs £150m a year to clean streets of discarded chewing gum. Wrigley said it was working to tackle the problem, which it blamed on "irresponsible disposal". It said it would contribute to a Department for the Environment, Food and Rural Affairs (Defra) scheme to prevent gum littering and make money available to councils for...