The events of Three Mile Island in Pennsylvania resulted in what? The accident killed thousands of sea birds, seals, and dolphins in the area.
The accident caused radioactive gases to be released into the atmosphere.
The accident made the surrounding area uninhabitable for decades afterward.
The accident created a greater interest in and funding for nuclear energy.

The accident caused radioactive gases to be released into the atmosphere.

Explanation:

In March, 1979, there was a nuclear accident at the Three Mile Island where a nuclear reactor suffered a partial meltdown. Even though things could have been worse, it was not significant to the point of human casualties.

It did however result in the release of radioactive gasses such as Xenon and Krypton. The accident led to increased regulation for the nuclear industry as people were concerned about a few event being much worse.