Simple:
* The environmental agency is overseeing the remediation of the contaminated site.
* The teacher provided extra exercises for remediation of the student's math skills.
More complex:
* Remediation efforts were crucial to restoring the ecosystem after the oil spill.
* The company's remediation plan included removing the hazardous materials and replacing the contaminated soil.
* The city implemented a remediation program to address the high dropout rate among at-risk students.
Figurative:
* After years of neglect, the garden needed a serious remediation to bring it back to life.
The word "remediation" can be used in a variety of contexts, but it generally refers to the process of correcting or fixing something that is wrong or damaged.