The war in Ukraine is continuing to have unexpected consequences.
The cut in Russian gas is leading to a shortage of chemicals which are used to reduce the emissions of nitrogen oxides from waste incinerators.
If there are not enough chemicals then the plants will break their legal emissions limits and so will have to be shut.
But waste companies say that will quickly lead to a backlog and rubbish mountains.
They have told the government about the impending problem and say they need an emergency plan, quickly.