It is also one on which an enormous amount of research remains to be done.

Since 1750, the average amount of energy coming from the sun either remained constant or increased slightly.

The amount of costs remains to be determined by assessment.

The amount dropped to about $100 million in the last recession, and has remained there.

Still, an enormous amount of work remains to be done.

A significant amount of the station including the platforms still remains.

"Despite these impressive results, a significant amount of work remains to be done," he said.

A significant amount of time remains before teams even have to plan for it.

The situation is very uncertain, however, and an enormous amount remains to be done.

Small amounts of oil and gas remain to be produced from this field.