Heat waves, droughts and extreme weather are endangering people and ecosystems somewhere in the world almost every day. These extremes are exacerbated by climate change, driven primarily by increasing emissions of greenhouse gases that build up in the atmosphere and trap heat at the Earth's surface.
With that in mind, researchers are exploring ways to pull carbon dioxide out of the atmosphere and lock it away — including using the ocean. But while these techniques might work, they raise serious technical, social and ethical questions, many of which have no clear answers yet.
