The Scottish Environment Protection Agency is trying to establish why a large expanse of foam has appeared on the River Clyde in Glasgow.
A massive fire at a tyre recycling depot in Renfrewshire was started deliberately, police say.
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.
(plans have been drawn-up for a new town in South Lanarkshire) A new town based on cooperative principles