Cost-benefit analyses for individual products become so confusing that even ardent environmentalists give up.

Barnes is an ardent environmentalist and an outspoken advocate of the need to reduce carbon emissions.

She is an ardent environmentalist and is active in community service.

And ardent environmentalists should keep a sense of proportion.

There are also features of the development that the most ardent environmentalist would admire.

But it does not expect to sell many cars to individuals, even ardent environmentalists, in the near future, because its costs are so high.

Not even the most ardent environmentalist could have predicted such wholesale recycling.

"I know that this will not sit well with ardent environmentalists," Mr. Woods said, "but what else can one say?"

I am not what you would call a tree-hugger or even an ardent or active environmentalist - life goes on, right?

While the most ardent environmentalists reject this incremental approach as inadequate, many elected officials embrace it.