They should oblige people who create waste to clean up after themselves and ideally ensure that the price of any product reflects the cost of disposing of it safely.

ECONOMIST: Talking rubbish

The officials reply that Rome was not built in a day, and they cannot be expected to clean up Houston overnight: after all, it took 30 years to get that way.

ECONOMIST: The Lone Smog State

The subliminal message from their questioning of key witnesses seems to be that they will recommend some pretty robust measures to clean up British banking - because they are not convinced that enough has been done after scandals over the mis-selling of Payment Protection Insurance (PPI) and interest swaps to address the problem of serious misconduct.

BBC: Week ahead in committees

The church pastors said they expect protesters to provide security and medical care and clean up after themselves.

WSJ: Occupy Wall Street Protesters' New Home: Churches

In Chicago, for example, two aging coal plants shut down after Mayor Rahm Emanuel threatened them with an ordinance requiring they clean up emissions.

FORBES: EPA Chief Resigns: Declared Carbon Dioxide A Pollutant

After being identified through the tags they used, the boys were made to clean up their graffiti at David Lister School and a youth club.

BBC: Graffiti vandals made to clean up

However, researchers from the Massachusetts Institute of Technology (MIT) say they have found a method of recovering oil after a spill using magnets, potentially saving companies like BP money in clean up bills.

CNN: Cleaning up oil spills with magnets and nanotechnology