His ideas never disappeared; indeed they influenced the new field of environmental history.

The idea then disappeared until it was revived more than three decades later.

This was a real big issue because many ideas and situations had already changed or disappeared with the conservative government.

In the Senate negotiations, however, the whole idea of alternative fuels disappeared.

The very idea of a long slow evening probably won't completely disappear.

It'll be business as usual, and all your ideas will disappear.

The idea of sleep had disappeared right off the map.

But that idea soon disappeared from discussions with the company.

During the 18th century this idea waned and finally disappeared as the two party system developed.

It's very important that we look at it again because this idea has almost completely disappeared today.