Hal Moseley

From Memory Alpha, the free Star Trek reference

Hal Moseley was a scientist on Penthara IV.

He enlisted the help of the USS Enterprise-D when the planet was threatened by environmental changes caused by an asteroid that hit an uninhabited part of the planet. A nuclear winter was a possibility. Geordi La Forge and Data tried to help with the problem. At first the Enterprise used phasers to release gas into the atmosphere to counter the effects of the nuclear winter. However, this only caused more damage, as the planet was hit with a series of earthquakes.

Moseley and La Forge decided on a solution that would either solve the problem or kill everyone on the planet. They initiated a chain reaction in the atmosphere that solved the problem. (TNG: "A Matter of Time")