The argument that the national debt imposes a burden on future generations becomes more compelling as

It becomes more compelling as it increases over time. Basically, when you owe money and die, your children have to pay it back. Then they accumulate their own debt so their children have to pay it then. This goes on for years and years and you end up with a huge national debt that the generations can't pay back and everyone keeps working for money that they don't have.

She was among the main submerged adventurers to make utilization of present day independent submerged breathing devices.

Explanation:

Sylvia A. Earle is a previous boss researcher of the national oceanic and atmospheric administration ( NOAA ) and she was among one of the main American oceanographers. She was among the main submerged adventurers to make utilization of the present day independent submerged breathing devices (SCUBA) gear, and distinguished numerous new types of the marine life.

American oceanographer and pioneer known for her exploration on the marine green growth and her books and documentaries intended to bring issues to light of the dangers that over fishing and contamination postures to the world's seas.