Specifically how to account for ecological costs and tax based on such costs.

These by-products would have to be replaced by something else, with its own ecological cost.

They were also supporters of ecological, low cost, decentralized, and user-friendly technology.

But the dollar figures do not reflect the ecological, social and health costs, wildlife experts said.

Electricity, telephones, running water - once humans experience these things, they want more of them, no matter the ecological cost.

The economic or ecological cost of ozone damage to wild vegetation has not been estimated.

The social, economic and ecological costs of this policy are so great that it must be changed.

The resulting economic and ecological costs are hard to predict.

Business activity has ecological costs that are often not taken into consideration in financial accounting.

In addition, the ecological costs should be (but typically are not) considered.