Remediation technologies work to decrease pollutants in the air, soil and water. Learn how we may be able to undo some of the damage that we've done to the environment.
Coral grows faster when it's cut or broken and scientists are taking advantage of that to replenish depleted reefs.
The controversial technology of reflecting sunlight away from the planet could help blunt the worst impacts of climate change. Harvard University climate scientist David Keith weighs in.
By Betsy Mason