The Scottish Environment Protection Agency is trying to establish why a large expanse of foam has appeared on the River Clyde in Glasgow.
View from BBC Scotland building
Two conservation charities renew their call for seven new national parks to be created in Scotland.
A week of Scottish-themed events in New York are started by the first minister with a "tartan" race.
New government legislation aims to try and tackle the problem of fly-tipping and litter-dropping with increased fixed penalties.
South Lanarkshire new town plan opposed by council planners