"We want to improve mobility without contributing to sprawl," he said.
So can the well-meaning traveller experience the splendours of Angkor without contributing to its decline?
Increasingly, it is possible to enjoy the intelligent animals and their fellow water-based species without contributing to animal cruelty.
"But how you do that without contributing to additional stigma is a challenge we're all confronted with".
She has said she preferred sanctions that would work "without contributing to the suffering of ordinary" Iranians.
Any energy residing in the internal motions of the individual molecules is simply carried separately without contributing to the pressure.
Racine is the latest victim of what some have called "lights-out London" where absentee owners push up property prices without contributing to the local economy.
The term "smart growth" is used to describe development that meets an increasing demand for suburban housing without contributing to sprawl.
Modern recycling of spent nuclear fuel makes nuclear power sustainable and essentially inexhaustible, minimizes the risks of nuclear weapons proliferation and operates without contributing to climate change.
You can use it without contributing to its maintenance and without paying a cent to all those programmers who created and improved it.
And there are practical and ethical problems in giving alcohol to abstainers without making them aware of it and without contributing to accidents.
