How can we combat climate warming? Some scientists say geoengineeringinterfering with Earth's systems to counteract climate changeis the answer. Explore ideas such as reforestation, space mirrors, and carbon capture, and learn about the pros and cons of these controversial technologies.

Containing 97 percent of Earth's water supply, the ocean plays a huge role in regulating global temperatures, supporting plant and animal life, and contributing to the livelihoods of millions of people. But in spite of all this, the ocean remains drastically unexplored, and the details of its impact on human lives aren't fully understood. Scientists from around the world are realizing that to address issues plaguing the ocean, such as dead zones,...