Concrete's main ingredient is responsible for 7% of global man-made greenhouse gas emissions. CarbonCure has figured out how to trap CO2 in concrete and make it stronger in the process. Now, LinkedIn is building with it.

Top consumer brands like Nestlé and Unilever are partnering on a new service called Loop that lets customers buy household items in innovative reusable containers and return them once they're finished. Here's how it works.